Wizfrog

Wizfrog is the boss (or possibly mid-boss) of Birdphone's Revenge. It is an amalgamation of frogs and wizards created by the Birdphone to trap Marty.

This boss can only be attacked from the rear. Finding out which side is the rear is the most difficult part of the boss fight.

MeccaPrime describes the Wizfrog as "mid-boss material".