The good thing about most field finds is the value is that you found them. As a monetary thing you aren't going to do nearly as well as minimum wage after taxes.
I believe the most you can say about the biface is that it's a biface. I would not think tomahawk head. We have chipped axes that resemble the form of a modern hatchet, and actual hatchets, with chipped blades and ground bits. Your biface does not fit their description. And folks are right about value. Better off saving them, or give them to someone you love.
Selling them might get you a meal at McDonalds. They are one of the most common point types in our region, and they are only field grade in quality. I'd be happy to find them, but minimal value.
My most valuable points are the ones I found as a kid & those my late brother found. Almost all but a few are field grade but I wouldn't sell them for anything.