A type of fish that makes croaking sounds, or a person who complains or speaks in a hoarse voice.
From the verb 'croak' combined with the agent noun suffix -er. 'Croak' comes from Old English and is imitative in origin, representing the sound itself.
Croaker fish actually produce sound using specialized muscles that vibrate their swim bladder—it's essentially a built-in drum, which is why these fish have been described as 'croaking' for centuries by fishermen.
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