glad you posted pics of seedlings
i had gotten a couple of seeds that didnt come up
other seedlings are popping up (no tags) ... now i know its not them.
Have you ever had the seed /nut ?
i read there are tiny hairs that itch on the husk that are a pain to deal with ??
there are a few relatives that are also edible
but, i have no idea if they are "good", as good, etc...
i saw one for sale on ebay a while back as a 3ft seedling tree.
but i am still suspicious about those hairs, and, ease of eating them out-of-hand.