cronk vs croak

cronk is not a noun while croak is a noun.

Word	Noun	Adjective	Verb	Adverb
cronk	No	No	Yes	No
croak	Yes	No	Yes	No

As verbs, cronk and croak are synonyms defined as:

cronk (noun)	croak (noun)
	a harsh hoarse utterance (as of a frog)

cronk (verb)	croak (verb)
utter a hoarse sound, like a raven	pass from physical life and lose all bodily attributes and functions necessary to sustain life
cry like a goose	make complaining remarks or noises under one's breath
	utter a hoarse sound, like a raven