The current known members of the Mutanimals are Hob (leader), Bandit, Herman, Pete, Puggle, Ray and Sally. Diamond, Lindsey, Mondo, Seymour and Slash are no longer part of the organization. Leatherhead and Mona were never members. And Rockwell isn't...

...Oh, you meant in the 2012 TV series. That show left so many plot threads dangling that it became a lost cause hoping they would be given closure. Some call that the Chris Carter effect.

Anyway, Rockwell and Pete were members, but the third character you mentioned was never actually established to have joined—another dangling plot thread.

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