Fun Fact! Romans actually generally did not regard the peoples they conquered as worshiping different gods than the Romans themselves did. After all, doesn't everyone worship a god of war, and a god of family, and a god of healing? What does it matter, theologically speaking, what worshippers call them? A rose by any other name...
Toutatis is usually identified by Roman sources as either Mercury (the god of trade) or Mars (the god of war), just worshipped under one of those funny, furrin names! Silly Gauls and their silly language!