Each troll is made of multiple infected humans, and can not only survive loosing a limb, but said limb can still operate alone. The Fridge Horror comes from the limb's head calling for help. A 90-odd year old head, saying "help me" as it tries to kill you.
Finland. Tuuri has revealed it to be a place where the people are barely hanging on, where each summer people will go out trading. Only sometimes, they come back with the same goods because the town they went to was just... gone.