Tyro

Tyro is a former farm turkey who was mutated by Krang into a miniature tyrannosaurus rex using his mutagenic virus. Donatello, who had been captured by Bebop and Rocksteady and held captive by Krang, befriended him and tied his bandana around his neck.

While Donatello was being escorted by Bebop, Rocksteady, and some Foot Soldiers, Tyro bit Rocksteady on the butt and escaped. He made his way to the Turtle Lair, where Krang had sent a robotic Donatello to masquerade as the real one and keep his family from getting suspicious. Tyro went up to the fake Don, biting his leg open and exposing him to the Ninja Turtles and Splinter. Between the robot and seeing Don's bandana on Tyro's neck, they deduced that Don was in trouble and followed Tyro back to Krang and his goons and saved Don.

After the Turtles defeated the villains, Tyro went to live on MacAndrews Farm with the other miniature dinosaurs.