The term "cannibal" means to eat the flesh of one's own kind. In this case, a "cannibal troll" would only be eating the flesh of other trolls, so humans should be safe.
The Troll's hands are shown frequently and are clearly human with manicured nails.
The main character starts out saying she 'always over-packs' as she fills a suitcase, but the characters only carry rucksacks, none of which is full enough to carry the tents and bottles of wine they take with them.
Early scenes make much if compass directions, but the group do not have a compass and are clearly unable to read the map they have, despite being familiar with the area.