Ohhh no fuckin way bro, watched my uncles and brothers play with frozen paintballs and my older brother ended up with a broken rib from impact of a frozen paintball, those things are gnarly as hell
My cousins used to attempt the frozen paintball thing....but then he attempted marbles once....it was bad lol. He never did it again. We were like 12 and he really didnt know it would be that bad