noun, plural mud·pup·pies.
  1. any of several often large, aquatic salamanders of the genus Necturus, of eastern North America, having bushy, red gills and well-developed limbs.
  2. any of several North American salamanders of the genus Ambystoma.

Origin of mudpuppy

An Americanism dating back to 1880–85; mud + puppy Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018