Where did you find it, how old do you think it is? I'm not saying it is, but it could be a spontoon, which was a badge of rank carried by non commissioned officers, this during the revolutionary war and 1812. Clark (Lewis and Clark) recorded killing a rattle snake using his spontoon at Pompey's Pillar on the Yellow Stone River.
This is what Wikipedia has to say about spontoons.
"The spontoon was in wide use by the mid 17th century, and it continued to be used until the mid to late 19th century. Unlike the pike, which was an extremely long weapon (typically 14 or 15 feet), the spontoon measured only 6 or 7 feet in overall length. Generally, this weapon featured a more elaborate head than the typical pike. The head of a spontoon often had a pair of smaller blades on each side, giving the weapon the look of a military fork, or a trident." The blades to the rear of the head were for tangling or cutting the bridle reins of the enemy's horse.
Non Com with a spontoon
This is a spontoon and halbred.
These are a couple of found spontoon heads.
And the Indians made tomahawks using spontoon heads. This is an original 1800's pipe tomahawk.
Something an Indian worked over, or traded for. We usually see the pipe tomahawks, but they also made gunstock tomahawks or war clubs 
