Folklore. Or Popular Antiquity. Pop Culture, Fine Culture, Folk Culture. These are the three types of culture used in the world today. Can you tell which picture belongs to which culture?. Pop culture. The media passes it down Short life span Author is traceable. Fine Culture.
The truth? It was probably some form of cancer or other disease.
Parents told their children about trolls and the bogey man to keep them from going outside or away from them at night. They used the tales to keep the kids safe.