what kind of chestnuts????

what kind of chestnuts????

I'm visiting my folks in Virginia (Charlottesville)and my niece and nephew are throwing these things at each other. I know we used to call them ITCHY BALLS but I don't think that's the latin name haha. What are these ? I think they're some type of chestnut...?? Not sure what zone, it's right by the Blue Ridge Mountains. thanks!
FINALLY!

FINALLY!

Hey Youse Guysa

Hey Youse Guysa

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The next chapter . . . . .

The next chapter . . . . .