Don't have an opinion what they are. But neat finds!
So many different crystals have been found in the United States. Can you tell us which state and county or creek they were found in?
Sapphires are actually fairly common stones in part of the country. These look like they have too much pink and red to be sapphires, but I'm not a gemologist, either.
I tried to scratch it with a piece of Quartz, it's hard to tell if there are any scratches on the possible Sapphire's due to the roughness of the stone. I was able to grind down the Quartz with the possible Sapphire's though.
Simply put , no . If you just Google search images for raw sapphires and your can look at sapphires from all over the world and your's isn't judging by shape and color ... And in order to properly ID via "Scratch Testing" you'd have to know and be 100% positive that what your item and the one being scratched has the proper ID as well . Your best bet is to consult a College or University if there are no local gemological experts near you . IMHO , Woodstock