One theory is that the bog bodies were actually offered as a sacrifice. Ulla Mannering of The National Museum of Denmark said that the bog's peat was used for heating homes. She added that, for ancient people, "When you take things, you also offer things." So this body may have been an offering to the bog.
Tollund Man isn't the only bog body to be found. This is Elling Woman, a body that was found near the same location as Tollund Man but was discovered 12 years earlier. It wasn't until 1976 that they were able to determine that she was from the same era and Tollund Man and that she was likely also hanged as well.
This is Haraldskaer Woman, who was found in Denmark in 1835. At first, it was thought this might actually be the body of the Norwegian Queen Gunhild, but further testing proved that this body was also from the Iron Age and could not be the Queen.