I visited one of my trap locations and I found this peculiar catch.
Note how there's a land tile to the left of the reindeer but it still didn't manage to climb out.
IIRC I've seen elk that managed to break the ice on an iced tile, climb on a solid ice tile, and repeat for about 5-10 tiles before drowning.
The trap pits below were baited with a raw meat cut and a turnip and/or a fistful of broad beans, which I'm pretty sure is what attracted the reindeer and the elk that I found in one of the trap pits.
In the future I'll drop a raw meat cut and a turnip on a similar ice tile with tree trunks on it and see if this trap will attract animals. I'll make sure that there isn't any other bait nearby.
Unless you are unable to make trap pits, I think making this kind of trap is not worth the effort. On the other hand if you have made your settlement adjacent to a water tile that is not rapids, making this trap to catch any invading Njerpez might be worth it.