Pachycephalosaurus

Pachycephalosaurus, also known by its codename; “Ram Head” is a toy released in 1997 for The Lost World Series 1 toyline. The toy comes with four pieces of capture gear, which restrains the first half of the body. When the head is packed into the body, and the button on its thigh is pressed, the head rockets forward and can break out of its restraints.

Source: https://jurassicpark.fandom.com/