Gayle died and got a true resurrection, still tadpoled. Also, remember how your fall from the ship had finished. And what kind of magic was used to alter those tadpoles. Not the kind you would fool with some cheap tricks or common 9th level spells
The true resurrection spell should have removed the tadpole from Gale actually. It's one of the official "cure" for ceremorphosis beside a miracle and the wish spell.
