Those kind of chopper/cleaver/scraper/celt/gouge tools are pretty common in the southeast. I don't think they are preforms, in that an ancient knapper would have just used a thinner spall of material to make a thinner point.
Also, those tools are usually of that tough/grainy material vs flint, in part because it probably is tougher than flint. The edge isn't as fine/sharp, but you could pound on bone/wood and not have the tool shatter.
Joshua