WordReference Random House Unabridged Dictionary of American English © 2020
mud•pup•py  (mudpup′ē),USA pronunciation n., pl.  -pies. 
  1. Reptilesany of several often large, aquatic salamanders of the genus Necturus, of eastern North America, having bushy, red gills and well-developed limbs.
  2. Reptilesany of several North American salamanders of the genus Ambystoma.
  • mud + puppy 1880–85, American.

Collins Concise English Dictionary © HarperCollins Publishers::
mud puppy n
  1. any aquatic North American salamander of the genus Necturus, esp N. maculosus, having red feathery external gills and other persistent larval features: family Proteidae
'mudpuppy' also found in these entries (note: many are not synonyms or translations):
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