I found an old root stump from a dead young cherry tree. Someone dumped landscaping waste (grass clippings, twigs, small branches, etc.) off the road by the creek. I was on a hunt for anything interesting and after three hikes on three different days next to different rivers and creeks, found nothing useful but that! Someone else's trash,
So keep your eyes open for some other interesting options, even contacting some landscapers who pull out young trees and replace them, you never know, LOL. Even home depots will take back dead trees, you could always keep your eyes open there too, just clean it really well. Since I didn't know of its origins, just soaked for a very long time and changed the water frequently, and scrubbed it very well several times.
It is the stumpy, spiky piece in between the outer two smoother pieces, at the center. Free & cool!