Here in the Southern US we do have some strange fish. This used to be my favorite to catch on a rod and reel, although many fisherman use a bow and arrow and hunt them rather than fish for them. They are common in still water and are often seen at the surface of the water. In the water they do look like alligators. They are called Alligator Gar.
they can be very large. Audubon wrote about finding them 20 feet long approx 7 meters long. the largest I ever caught were about 8 feet long (2.5 M)
Here is an old picture I found online that is about the size of the largest I ever caught (OK it does look 3 or 4 feet longer than mine was)