We have shagbark here & I agree it doesn't really look like it. They nuts are much bigger. But a pic of the whole tree could help too.Hickory. Not sure which species. Nut does not look like shagbark or shellbark. A thin husk could be bitternut or pignut. In any case good pig food.
Please do, I'd love to hear. I've seen it done on PBS & thought it neat.I will get my dad to explain how he makes the roti flour and post it.