What gods did the mongols worship?

The Old Mongolians were mostly polytheistic meaning they acknowleged many gods. Their chief god went by Tengri who was basically nature itself in the Mongolian world. But there were other "heavenly beings" that served this God and that they also acknowledged like the sun and moon gods. The Mongolians also believed more in shamanism, in which the messenger conveys the message to the people through one particular individual. The names of many of the gods vary.