"The Hattifatteners are tall, thin, ghost-like creatures, resembling long white socks. They have round neckless heads with two round eyes. Below their heads on either side are four or five finger-like projections that resemble hands. They are silent and serious, having neither the ability to talk nor to hear, but in contrast, their sense of feeling is extremely acute, and they can sense even the most minor tremblings of the ground. They communicate seemingly by telepathy, and their eyes change colour with the sky. They also seem to be melancholic characters. However, despite physiologically resembling animals, Hattifatteners grow from seeds. Planting Hattifattener seeds where someone has taken up residence is an effective way to get rid of him or her." -- Wikipedia
Now, you can plant some of your own! Print this thing with settings of your liking. Layer height can be quite big - the ridges don't show up in the cast snow objects. To save the amount of plastic, the infill ratio can be low. I think I used 15% but even lower would work just fine.
After printing, apply some suitable snow "mold release" such as candle wax on the interior surfaces, stuff some well-packing snow in the mold, and have a blast. I have found releasing of the cast items to be a bit finicky - probably not worth trying unless the snow is very wet and perfect for making snowballs.
Additionally, the face mold can be used for making hattifattener imprints in snow.