Hi Jake, 
 
The piece does look like the head of a rogatina, minus the toggle.  I'm guessing that the toggle is like the cross-bar on a boar spear, meant to keep the bear from charging up the spear staff?  I'd also guess that's why the spear is was forked in the old days.  
 
Just as a cross-reference, the Chinese used a tiger fork in hunting tigers, so I don't think it's unusual to use a large, sharp forked anything to hunt a large predator.   
 
As an aside, back in the 80s, an arctic explorer decided to carry a 12' pike rather than a gun.  They were working in a polar bear area, and he thought it was more fair to carry a spear.  He never had to use it, which was just as well, because he assumed he'd die if he had to face off against a bear.   Considering he didn't have a cross-piece on the spear, he was probably right. 
 
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