Medals in War Tycoon are a type of currency that can be earned by leveling up in the game. The number of medals you receive depends on the level you reach, with amounts ranging from 10 to 100 medals for the next level. Medals can be used to claim multiple characters and gun skins in the game. It is not clear if medals have any other use in the game, but they are considered a valuable currency that can help players progress and become better in the game.