Bear Tracks, but his actual name was Johnny Schmitz.
He was a member of the Cubs during some of their darkest days, but Schmitz was also one of their best players. He actually won 18 games (and appeared in the All-Star game) for one of their worst teams of all-time, the 1948 Cubs. So of course, they traded him.
Bear Tracks passed away this weekend in Wisconsin at the age of 90.