When I was a kid my friend and I would jump on the trampoline and since we had two large silver maples above it it collected a lot of “helicopters”. We would peel them and collect the seeds just for fun, always trying to find a way to use them and earn money from selling some sort of product. Since for some reason no one wanted to buy 2 inch tall maple tree saplings, we tried to figure out if the seeds were edible. When we found out they were, we prepared them any way we could. We ate them raw, we put them in a bowl in the sun, we boiled them, roasted them, and even tried them with cinnamon sugar. (My favorite way to eat them was boiled with a little bit of salt.) One time I dried them and ground them into flour. All that to say, yes they are edible and not always disgusting.