Rocky J. Squirrel, also known as Rocky, is a flying squirrel who is close friends with Bullwinkle. He isn't as naive as Bullwinkle and seems to sence when something is wrong faster. Although his age is widely argued over, he is usually portrayed as younger than Bullwinkle.
He's been friends with Bullwinkle ever since they met, which is like 1959. They've been on many adventures and they always have eachothers backs.