Maybe a 3rd tool

[Older The Better]

I did find this one within feet of the other two I posted but I’m not so sure from one edge Id say absolutely but the lack of real scars, cortex level of patina, and the thick other edge has me leaning towards not

 

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[Tdog]

I'd say that's a good study piece. A backed knife would have that anatomy but I agree that it doesn't show any definite flaking evidence. Jury's out still!

 

[Older The Better]

Backed knife is an interesting thought I tried some pics with low angle light, maybe a whisper or two of a scar but still looks mostly naturally formed, except that edge, I’d add it was found up on top a bluff well away from the river and any streams so water action erasing features seems unlikely.

 

[Older The Better]

Also interesting the similarities with a piece found feet away

 

[littlewindmill829]

Those comparison photos are super interesting. Tough one!