CROAKER
croaker
(noun) any of several fishes that make a croaking noise
croaker
(noun) the lean flesh of a saltwater fish caught along Atlantic coast of southern U.S.
Source: WordNet® 3.1
Etymology
Noun
croaker (plural croakers)
One who croaks.
(dated) A vocal pessimist, grumbler, or doomsayer.
A frog.
A fish in the family Sciaenidae, known for the throbbing sounds they make.
(slang) A doctor.
Source: Wiktionary
Croak"er (-r), n.
1. One who croaks, murmurs, grumbles, or complains unreasonably; one
who habitually forebodes evil.
2. (Zoöl.)
(a) A small American fish (Micropogon undulatus), of the Atlantic
coast.
(a) An American fresh-water fish (Aplodinotus grunniens); -- called
also drum.
(c) The surf fish of California.
Note: When caught these fishes make a croaking sound; whence the
name, which is often corrupted into crocus.
Source: Webster’s Unabridged Dictionary 1913 Edition