Naturally, all of Scandinavia is infested with trolls, although not necessarily hiding under bridges. They can either be big and slow-witted, or not that much different from humans, but they aren't Christian and they do turn to stone when exposed to the sun. Lots of odd rock formations in Norway are really stone trolls. There are also many areas that are troll-free, that is because there are too many church bells in those places.
