croak.er
n.(名词)
A croaking animal, especially a frog.蛙:呱呱叫的动物,尤指蛙A person who grumbles or habitually predicts evil.预报凶事者,发牢骚者:发牢骚的人或经常预料凶事的人Any of various fishes, chiefly of the family Sciaenidae, that make croaking or grunting sounds.石首鱼:任一种主要属于石首鱼科的鱼类,能发出呱呱声或咕哝声