Talk:Snowgies/@comment-25693910-20150902011117/@comment-61573-20150916100116

The theory I am going with is that with Marshmallow and the Snowgies, she learned to imbue them with cryothermostasis (they stay cold without being affected by the external temperature). In the movie, you see Marshmallow has a supercooled core, because he exhales frozen airgusts. I'm assuming this coldness keeps him from melting.

Since Olaf was the first test of her ability to create living snow and created by accident, it is highly likely he had problems that were not present in successive creations.

And even though it isn't canon, in Once Upon a Time, we see Marshmallow walking about in normal temperatures completely unaffected.