What role does the Poro King play in Frejord?

Since the game mode was called "The Legend of the Poro King", I don't think it's certain that he even exists. Even if he does, most people have definitely never actually met him. Therefore, I don't think he plays that major of a role in the mythos of the Freljord, and his tale is probably mainly something you tell children as a bedtime story.

Nah,he's the King of Valoran. Demacia & Noxus going to war?He turns them into Poros. The war in the Freljord?He have the 3 queens settle it with a snowball battle. Shurima have returned?Sand castle building contest. Is it Harrowing?Let's make a scary movie out f it.

Poro King is love,Poro King is life.

There is also trundle the troll KING so i doubt he is the king of everything. (freljord)

I think he is something like the patron of the poro,he might not even physically exist in the world,but only manifest under certain conditions(like throwing poros into the faces of your enemies).

I think the poro king is just king of the poros

what are you talking about, Sejuani is the only true queen.

I don't think he's canon at all.