Timber Wolf
Bigger, stronger versions of the ordinary wolf, Timber Wolves are aggressive, but have relatively low health.
Torchbugs are small, nocturnal insects that are frequently found in the more temperate areas of Skyrim. They are prized for the usefulness in crafting potions.
Trolls are dangerous creatures with great strength, three eyes and amazing regenerative properties. Some believe a troll can only be completely killed if you burned the corpse; otherwise, it would come back to life after a short time. This isn't necessarily true. Fire is very effective against trolls, but it's not necessary to kill them.