Looks like it could be a net/fishing weight? Maybe? If it is an actual native artifact and you get it appraised it could be around $100-300 worth if that's what it is. Unappraised, maybe $50 if you're lucky.
The crocs are worth about $10 used
The only other native stones that I've seen shaped close to that were fishing weights.
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Not sure but interesting...I would have carried that one home as well...kinda matches some of the arrow straighteners on line but its different with groove going around the end?....could be a weight but not sure....interesting.