Croak/krəʊk/ Definition 1 of 3Pro Tip 1/2Animal Sound Used to describe the natural sound made by frogs, toads, or metaphorically by a rough voice. We could hear the toad croak in the swamp. Pro Tip 2/2Onomatopoeic 'Croak' mimics the sound it describes, making it easy to remember how a frog sounds. My throat was dry, and I started to sound like a frog's croak.