mud puppy

(noun) aquatic North American salamander with red feathery external gills. Synonyms: mud puppy, Necturus maculosus.

(noun) large salamander of North American rivers and streams. Synonyms: hellbender, mud puppy, Cryptobranchus alleganiensis.

(noun) larval salamander of mountain lakes of Mexico that usually lives without metamorphosing. Synonyms: axolotl, mud puppy, Ambystoma mexicanum.