Yes.  If a member wants to join anonymously, here are two options:
Request to be marked as anonymous in the AAFD’s CRM system (member database).  This does not protect you against true anonymity as the association leadership will know who the member(s) is/are, therefore, your identify could be known.
For true anonymity, the member should join through an attorney who will certify that he is legal counsel for the franchisee who desired to join anonymously.  The chapter leaders may want additional validation that the member is, in fact, who he claims.  Using this method, the AAFD doesn’t know who the member is and true anonymity is achieved.