See under croaker(def 2).
Origin of Atlantic croaker
First recorded in 1945–50
Origin of croaker
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
an animal, bird, etc, that croaks
any of various mainly tropical marine sciaenid fishes, such as Umbrina roncador (yellowfin croaker), that utter croaking noises
a grumbling person
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
"prophet of evil," 1630s, agent noun from croak (v.); a reference to the raven (cf. Middle English crake "a raven," early 14c., from Old Norse kraka "crow," of imitative origin).
Online Etymology Dictionary, © 2010 Douglas Harper