One of the great things about trolls is that they have skulls for eyes, which are really other trolls.
And there’s no rule that limits them to two eyes, either!
Icelanders started playing around with imported North American lupines a couple generations go, to try to stop erosion. The things do stop the land from blowing away, and they are mighty beautiful, for sure, but they’re also a bone of contention, as they change the colour palette of the landscape profoundly and reduce the number of species that can thrive. Nonetheless, it remains an uncertain tradeoff, with some people planting lupines and others tearing them out. One of the species that doesn’t mind is the Icelandic Troll. Here’s one who seems to be thriving among the beautiful weeds.
Both are heads. Literally. The word remains in English as a cob, known in cobblestones (each has a round head) or a cape, which is also a headland, and that’s the Icelandic word: hæð, or head, or height. Remember that for the culture that settled this magical place, these really were heads. And so they remain.
Troll, Just Hatched, at Dimmu Borgir