I’m sure he could if he was so inclined! But I always imagined that he has a stronger connection to heat and molten things— he’s more apt to simply manipulate the rocks themselves than use ice as a round about way of doing it. But that does bring to mind a spooky scenario where any elves trying to BUILD in the North would find that the elements themselves had a slow, malicious sentience that would make stones crack and foundations crumble and shift…
