Possible Clues:

• Shape of a certain kids' nugget
• Shape of some chicken nuggets, briefly
• Stegosaurus, e.g., for short
• Purple pet on "The Flintstones"
• Velociraptor, e.g., briefly
• Pet in the town of Bedrock
• Hoppy the Hopparoo’s neighbor
• The Rat Pack's Martin, to his buddies
• Stegosaurus, e.g., informally
• ''Jurassic Park'' menace