Fusion Amphibian

Amphibian mutates have had their DNA fused with the DNA of any cold-blooded vertebrate of the class Amphibia, comprising frogs and toads, newts and salamanders, and caecilians, the larvae being typically aquatic, breathing by gills, and the adults being typically semiterrestrial, breathing by lungs and through the moist, glandular skin. This includes the various prehistoric species.

Traits
These mutates tend to have the behaviors, as well as bodily features, of the amphibian or amphibians that they are fused with. For instance, before they reach puberty, they may be completely aquatic, with tails instead of legs. They will also grow up similarly to amphibians, so they may have either powerful frog or toad legs meant for jumping, long tongues for catching prey, or salamander tails. They will also tend to have rather slimy or dry, bumpy skin. They may either be quite self-conscious about their appearance, or they may not even care how they look.