Found these. I still dig some iron occasionally to see if it's something besides square nails. Found these in park woods near old homesite location trying to get more info than just " antique" . I've been using vinegar to get the stubborn rust off
Not to be a downer but they could be the ends from a dog run cable.
I've dug quite a few. I didn't answer your question, sorry about that.
Hopefully someone has a more exciting ID.