Chunk

'''""He (Buzz) ain't the sharpest knife in the... uh.. place where they keep the knives!""

- - Chunk arguing with Sparks. '''

'''""Neither are you, Chunk!""

- - Sparks mocking Chunk (also the only time in the film where Chunk is mentioned by name). '''

Chunk is a large rock monster toy from Toy Story 3 who has two emotions, happy and angry.

He is voiced by Jack Angel.

Role in Toy Story 3
Chunk made his first appearance where the toys enter Sunnyside. Chunk was in the crowd once the Jack-in-the-box said "New toys!". Later, Chunk was seen on the interior of the vending machine where they are playing poker (See-'n-Say) Chunk got very mad and shouted that Ken was a girl's toy and Ken was mad. Chunk was later seen in one of Lotso's minions and during the confront, Chunk had his mad face. Chunk later reappeared in the end being reformed during the credits.

Toy Description
From Official Website:

Trivia

 * Chunk appears to be based on the short-lived Rock Lords toyline from the 1980s.
 * Many of the Chunk toys created have the face feature. However, some have it changed by pressing the spike on the top (as seen in the picture below toy description), and the others have it changed by swiveling his face.