<?xml version="1.0"?>
<ownershipDocument>
    <schemaVersion>X0201</schemaVersion>

    <documentType>4</documentType><periodOfReport>2003-08-04</periodOfReport>
    <issuer>
        <issuerCik>0001138951</issuerCik>
        <issuerName>LEAPFROG ENTERPRISES INC</issuerName>
        <issuerTradingSymbol>LF</issuerTradingSymbol></issuer><reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001218529</rptOwnerCik>
            <rptOwnerName>FORSYTH GERALD FREDERICK</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>6401 HOLLIS ST., STE. 150</rptOwnerStreet1>
            <rptOwnerStreet2></rptOwnerStreet2>
            <rptOwnerCity>EMERYVILLE</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>94608</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
            <reportingOwnerRelationship>
<isDirector>0</isDirector><isOfficer>1</isOfficer><isTenPercentOwner>0</isTenPercentOwner><isOther>0</isOther><officerTitle>Chief Operating Officer</officerTitle></reportingOwnerRelationship></reportingOwner><derivativeTable><derivativeTransaction><securityTitle><value>Nonqualified Stock Options (right to buy)</value></securityTitle><conversionOrExercisePrice><value>29.94</value></conversionOrExercisePrice><transactionDate><value>2003-08-04</value></transactionDate><transactionCoding><transactionFormType>4</transactionFormType><transactionCode>A</transactionCode><equitySwapInvolved>0</equitySwapInvolved></transactionCoding><transactionAmounts><transactionShares><value>250000</value></transactionShares><transactionPricePerShare><value>0</value></transactionPricePerShare><transactionAcquiredDisposedCode><value>A</value></transactionAcquiredDisposedCode></transactionAmounts><exerciseDate><value>2004-08-04</value><footnoteId id="F1"/></exerciseDate><expirationDate><value>2013-08-04</value></expirationDate><underlyingSecurity><underlyingSecurityTitle><value>Class A Common</value></underlyingSecurityTitle><underlyingSecurityShares><value>250000</value></underlyingSecurityShares></underlyingSecurity><postTransactionAmounts><sharesOwnedFollowingTransaction><value>250000</value></sharesOwnedFollowingTransaction></postTransactionAmounts><ownershipNature><directOrIndirectOwnership><value>D</value></directOrIndirectOwnership><natureOfOwnership><value/></natureOfOwnership></ownershipNature></derivativeTransaction></derivativeTable><footnotes><footnote id="F1">Granted 8/4/03 under the Issuer's Stock Option Plan.  Options vest 25% on 8/4/04; the remainder vest at the rate of 1/36 per month for 36 consecutive months.</footnote></footnotes><remarks/><ownerSignature><signatureName>G. Frederick Forsyth</signatureName><signatureDate>2003-08-05</signatureDate></ownerSignature></ownershipDocument>

