Great! My image is a pretty small castanea sativa (sweet chestnut), while the chinquapin is listed as castanea pumila (dwarf chestnut). So for me (as a non-biologist) that's the same! 👑
I'm from California where we have Golden Chinquapin (chrysolepis chrysophylla) which has fruit that looks the same, and leaves that are very similar (though with golden hairs on the undersides)
Looking them up, they are closely related to castanea. They also have edible seeds but the spiny shell is hard to get open.