Congrats bud and thanks for the pictures, those are all preforms/knives made by native Americans besides the "scrapper" (I'm 1000% sure).
As for the "scrapper", IMO it's a flake resulting from knapping activities (not a tool) but I could be wrong.
Keep looking in the area where you found the preforms/flake and I'm sure you'll find more cool artifacts. Also, could be worth checking on the riverbank nearby for a camp site. If you find a flake on the ground, dig a small hole, if you find flakes in the hole, you're most likely at the place where they were knapping tools!