Ross (also known as Freckled Pig) is a pig who first appeared in the game Bad Piggies. He is a basic pig the player controls in that game and the secondary antagonist in The Angry Birds Movie while Leonard is the main one. He usually reacts to how the player controls the vehicle, he will be frightened or enthusiastic. Ross can propel gray wheels, fans, propellers, spring-loaded boxing-gloves, and suction-cup wheels. When the player is stuck, Mechanic Pig fixes the vehicle that Ross rides. Ross appears in Angry Birds, in the Bad Piggies cut-scenes, where he is trying to take the eggs from the birds but he remains undefeated, while Mechanic Pig, Foreman Pig and King Pig are defeated.

More facts here: https://angrybirds.fandom.com/wiki/Ross