I can bear witness to playing hockey (mostly shinny) with frozen horse turds on f'ing cold rural Canadian lakes. They weren't any hell, as they wouldn't slide much, and they busted if you hit them moderately hard. We did it when I was a teenager, but we did it just to see what it was like. We also had hockey pucks. To those aficianados who want to work out the approximate date of this memory, this was in the days just before curved blades! (I can remember pals going through all kinds of effort trying to warp their sticks as the word spread that this was a good trick).
yours, Peter T.
P.S. I could never play hockey worth a damn.