Norb introduced Stump to the other creatures of the forest in the episode, "Guess Who's Stumping to Dinner?". Stump often moves on his own while he is off-screen. In "Brothers... to the End?", he is seen drinking punch with the others, which was the first time he actually moved on screen. [3]
Background Information
He is able to write as he wrote a goodbye letter to Norb and Dag. [4]
Stump with Tina.
His first love was Tina, a girl puppet made by Dag. [1]
He has a driver's license and drives a white pick-up truck. [2]
He played the flute during Norb's classical music "jam session". [5]
He has many parallels to Plank from Ed, Edd, ‘n’ Eddy: Both are objects that characters carry around and think are alive (and might actually be), and both have a “dumb” smile on their face.