Purely a theoretical question I'm afraid - I haven't experimented (yet). If you take popped popcorn and grind it to a flour, would the result be similar to cornmeal? One difference, I imagine, is that it is in principle ready to eat, as opposed to regular cornmeal which still needs to be cooked to denature the proteins.
Are there things you could achieve with this "popcorn meal" that don't work with regular cornmeal? For example, what would you get if you used this for making polenta? Could you make a "raw polenta" that doesn't require much cooking?