Any marine fish of the genus Batrachus, having a large, thick head and a wide mouth, and bearing some resemblance to a toad. The American species (Batrachus tau) is very common in shallow water. Called also oyster fish, and sapo. [1913 Webster]
toadfish, n. any marine fish of the family Batrachoididae, with a large head and wide mouth, making grunting noises by vibrating the walls of its swim-bladder.