There are in fact 4 kinds of gar. (gar pike is not a correct name, more of a nick name given to the fish because of it's slender body shape) I was pleased to learn that the gar we commonly catch here are Longnose Gar...and that is of coarse what I have on my wall!

The spotted gar are also found in the great lakes, but are extremely rare and are protected. Here is brief discription of each.
Longnose Gar

Lepisosteus is Greek, meaning "bony scale," and osseus is Latin, meaning "of bone." Longnose gar are distinguished from other gar species found in Texas by the long snout whose length is at least 10 times the minimum width.
Spotted Gar

Lepisosteus is Greek, meaning "bony scale," and oculatus is Latin, meaning "provided with eyes." This last is probably a reference to the many dark spots on the head and body. Spotted gar may be distinguished from other gar species by the dark roundish spots on the top of the head, the pectoral fins and on the pelvic fins.
I thought this was an interesting question from Legend and I'm guessing a lot of folks are not aware of the protected spotted gar.