AMPHIBIAN is validvalid

a cold-blooded animal that grows from a juvenile water-breathing form to an adult air-breathing form [n AMPHIBIANS]

89,681 of 196,601 in NWL2023·also valid in CSW24

any cold-blooded vertebrate of the class Amphibia, typically living on land but breeding in water, that includes newts and salamanders, frogs and toads, and caecilians [n -S]