Noun
mudpuppy (plural mudpuppies)
English Wikipedia has an article on:mudpuppyWikipedia
An aquatic salamander of the family Proteidae.
Common species such as the tiger salamander and the mudpuppy are being given hormones to stimulate the production of sperm and eggs, and the role of arginine vasotocin in courtship behaviour is being investigated. Source: Internet
This demarcation can be made by noting the presence of external gills in the mudpuppy, which are lacking in the hellbender, as well as the presence of four toes on each hind foot of the mudpuppy (in contrast with the hellbender's five). Source: Internet