What does bullhead mean in cooking?

bullhead means: This is a small freshwater catfish, usually weighing in under one pound. The flesh of this catfish is mildly flavorful and lean. (in Cooking Dictionary)

What else does bullhead mean?

• One of many stocky North American freshwater catfishes from the genus Ameiurus, A tail that has not been forked. (in Merlin Dictionary)
• One of the many sculpins. (in Merlin Dictionary)