croak

(noun) a harsh hoarse utterance (as of a frog). Synonyms: croaking.

(verb) pass from physical life and lose all bodily attributes and functions necessary to sustain life. Synonyms: die, decease, perish, go, exit, pass away, expire, pass, kick the bucket, cash in one's chips, buy the farm, conk, give-up the ghost, drop dead, pop off, choke, snuff it. Examples: "She died from cancer." "The children perished in the fire." "The patient went peacefully." "The old guy kicked the bucket at the age of 102."

(verb) utter a hoarse sound, like a raven. Synonyms: cronk.

(verb) make complaining remarks or noises under one's breath. Synonyms: murmur, mutter, grumble, gnarl. Example: "She grumbles when she feels overworked."