Those are like bi-pointed blades, just not as big as they are down south and out west. One being un-notched is likely unless it is a spilled cache then it is more then likely. Finding three of them on one site depending on how far apart they were found could be the sign of a pre-form cache. I keep leaning towards poplar preforms because I have found a slate one that looks like your pieces. I thought it was poplar knowing they share same form. I'm pretty good with eastern point types, i have never seen that type in the books. I'm starting to think that these pieces possibly were learned technology from the Ft. Ancient Culture or were these Ft. Ancient people and there range was further then what was documented?? It is something to think about.