Sneaking Snowman seems a lot more challenging to engage with, I love strong enemies.
But Ice moles could be interesting to engage with, if you can't see where the mole jumps out at all. And the mole is able to attack from all directions (up down left right).
If their behavior is programmed to chase you around for 60 seconds or so, It would be a fun enemy. But its true, the coding would be too complicated to program.