Frogs are members of the class Amphibia .
Amphibians are coldblooded vertebrate animals that lack scales and generally return to the water to breed. Frogs have squat bodies, long muscular hind legs, typically lack tails and metamorphose. Toads are frogs too and belong to the terrestrial frogs of the genus Bufo . Toads have stockier bodies, rounder snouts, dry and warty skins, and move by walking. Toads also lay their spawn in long strings.