from The American Heritage® Dictionary of the English Language, 4th Edition
- n. Any of several large North American salamanders of the genus Necturus, especially N. maculosus, that live in damp regions and have conspicuous clusters of dark red external gills. Also called water dog.
- n. See hellbender.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. An aquatic salamander of the family Proteidae.
mud + puppy, because of its barking sound. (Wiktionary)