Big oak tree in front of house growing up. Yard would be thick with these in fall. Bedroom upstairs, hear them hit roof, bounce and roll down. Brother and I raked up buckets full and then squared off with old tennis racquets. Big welts but we never put an eye out
It's bur oak, I was blowing leaves when I saw what I thought was an old tennis ball, turns out to be acorns. I had one a little bigger then the ones pictured but I couldn't find where I put it.
I bet if you painted faces on them, and called them something catchy like “snow kids” you could sell them at a craft fair for 2 or 3 dollars apiece. Could also do Santa Claus faces, or snowmen. Women go goo/goo over that stuff.