Baggalútur is an Icelandic gag cover band. They're also the much better side project of the front man for Hjaltalín. They've done a few yuletide albums.
Here they are, deeply sympathising with Leppalúði, Gríla's husband sitting home alone
now they're insisting that it's really not Christmas without a good, freshly shot rock ptarmigan
and finally, it's the days before christmas, you gotta do some arts and crafts. Entirely based on "thunder" rhyming with "föndur", the word for arts and crafts.