Hard to tell from your pics, but, coming from PA and playing in the local "cricks" from Montgomery, Bucks, and Lehigh Counties, they look like sucker fish. (horse head, yellow mouth, etc) If they are, they are harmless, keep to themselves-bottom feeders. Considered "trash fish" to PA Trout Fisher-people, but I always liked them.
-Stef*
-Stef*