<?xml version="1.0"?><?xml-stylesheet type="text/xsl" href="../4_X02.xsl"?><ownershipDocument>    <schemaVersion>X0303</schemaVersion>    <documentType>4</documentType>    <periodOfReport>2011-03-10</periodOfReport>    <notSubjectToSection16>0</notSubjectToSection16>    <issuer>        <issuerCik>0001138951</issuerCik>        <issuerName>LEAPFROG ENTERPRISES INC</issuerName>        <issuerTradingSymbol>LF</issuerTradingSymbol>    </issuer>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001263308</rptOwnerCik>            <rptOwnerName>MOLLUSK HOLDINGS LLC</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>101 YGNACIO VALLEY ROAD</rptOwnerStreet1>            <rptOwnerStreet2>SUITE 310</rptOwnerStreet2>            <rptOwnerCity>WALNUT CREEK</rptOwnerCity>            <rptOwnerState>CA</rptOwnerState>            <rptOwnerZipCode>94596</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>0</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>        </reportingOwnerRelationship>    </reportingOwner>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001263307</rptOwnerCik>            <rptOwnerName>CEPHALOPOD CORP</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>101 YGNACIO VALLEY ROAD</rptOwnerStreet1>            <rptOwnerStreet2>SUITE 310</rptOwnerStreet2>            <rptOwnerCity>WALNUT CREEK</rptOwnerCity>            <rptOwnerState>CA</rptOwnerState>            <rptOwnerZipCode>94596</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>0</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>        </reportingOwnerRelationship>    </reportingOwner>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0001263306</rptOwnerCik>            <rptOwnerName>LAWRENCE INVESTMENTS LLC</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>101 YGNACIO VALLEY ROAD</rptOwnerStreet1>            <rptOwnerStreet2>SUITE 310</rptOwnerStreet2>            <rptOwnerCity>WALNUT CREEK</rptOwnerCity>            <rptOwnerState>CA</rptOwnerState>            <rptOwnerZipCode>94596</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>0</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>        </reportingOwnerRelationship>    </reportingOwner>    <reportingOwner>        <reportingOwnerId>            <rptOwnerCik>0000901999</rptOwnerCik>            <rptOwnerName>ELLISON LAWRENCE JOSEPH</rptOwnerName>        </reportingOwnerId>        <reportingOwnerAddress>            <rptOwnerStreet1>C/O DELPHI ASSET MGMT CORPORATION</rptOwnerStreet1>            <rptOwnerStreet2>6005 PLUMAS STREET, SUITE 100</rptOwnerStreet2>            <rptOwnerCity>RENO</rptOwnerCity>            <rptOwnerState>NV</rptOwnerState>            <rptOwnerZipCode>89519</rptOwnerZipCode>            <rptOwnerStateDescription></rptOwnerStateDescription>        </reportingOwnerAddress>        <reportingOwnerRelationship>            <isDirector>0</isDirector>            <isOfficer>0</isOfficer>            <isTenPercentOwner>1</isTenPercentOwner>            <isOther>0</isOther>        </reportingOwnerRelationship>    </reportingOwner>    <nonDerivativeTable>        <nonDerivativeTransaction>            <securityTitle>                <value>Class A Common Stock</value>            </securityTitle>            <transactionDate>                <value>2011-03-10</value>            </transactionDate>            <transactionCoding>                <transactionFormType>4</transactionFormType>                <transactionCode>S</transactionCode>                <equitySwapInvolved>0</equitySwapInvolved>            </transactionCoding>            <transactionTimeliness>                <value></value>            </transactionTimeliness>            <transactionAmounts>                <transactionShares>                    <value>18000</value>                    <footnoteId id="F1"/>                </transactionShares>                <transactionPricePerShare>                    <value>4.42</value>                </transactionPricePerShare>                <transactionAcquiredDisposedCode>                    <value>D</value>                </transactionAcquiredDisposedCode>            </transactionAmounts>            <postTransactionAmounts>                <sharesOwnedFollowingTransaction>                    <value>1595258</value>                    <footnoteId id="F2"/>                </sharesOwnedFollowingTransaction>            </postTransactionAmounts>            <ownershipNature>                <directOrIndirectOwnership>                    <value>D</value>                </directOrIndirectOwnership>            </ownershipNature>        </nonDerivativeTransaction>    </nonDerivativeTable>    <footnotes>        <footnote id="F1">Sale of shares pursuant to pre-established Rule 10b5-1(c) trading plan, adopted November 3, 2010.</footnote>        <footnote id="F2">The reporting persons other than Mollusk Holdings, LLC disclaim beneficial ownership of these securities except to the extent of their pecuniary interests therein.</footnote>    </footnotes>    <ownerSignature>        <signatureName>/s/ Philip B. Simon, President of Cephalopod Corporation, Member of Mollusk Holdings, LLC</signatureName>        <signatureDate>2011-03-11</signatureDate>    </ownerSignature>    <ownerSignature>        <signatureName>/s/ Philip B. Simon, President of Cephalopod Corporation</signatureName>        <signatureDate>2011-03-11</signatureDate>    </ownerSignature>    <ownerSignature>        <signatureName>/s/ Philip B. Simon, President of Lawrence Investments, LLC</signatureName>        <signatureDate>2011-03-11</signatureDate>    </ownerSignature>    <ownerSignature>        <signatureName>/s/ Philip B. Simon, attorney-in-fact for Mr. Ellison</signatureName>        <signatureDate>2011-03-11</signatureDate>    </ownerSignature></ownershipDocument>