I'm not an *ologist of any kind, but it looks like a tree knot to me
https://www.publicdomainpictures.net/en/view-image.php?image=61663
I'm not an *ologist of any kind, but it looks like a tree knot to me
https://www.publicdomainpictures.net/en/view-image.php?image=61663
That's a burl (basically tree cancer), and any woodworker would give you their right arm for one that size.
Looks like burl wood
Chonka
Doesn’t chaga only grow on dead birch trees?