toad: "Any of numerous tailless amphibians chiefly of the family Bufonidae, related to and resembling the frogs but characteristically more terrestrial and having a broader body and rougher, drier skin"

newt: "any of various small semiaquatic urodele amphibians...having a long slender body and tail and short feeble legs"

bony fish: "A fish having a bony rather than cartilaginous skeleton"

metamorphosis (biological definition): "A change in the form and often habits of an animal during normal development after the embryonic stage. Metamorphosis includes, in insects, the transformation of a maggot into an adult fly and a caterpillar into a butterfly and, in amphibians, the changing of a tadpole into a frog"

All definitions were taken from thefreedictionary.com