The Turtle Megazord is a combination of the Megazord and the modified Metalhead.
It was piloted by the Teenage Mutant Ninja Turtles (and April O'Neil) when they temporarily became Power Rangers to battle giant-sized Bebop and Rocksteady, The Shredder's mutant duo henchmen.
The Turtle Megazord might look like a giant-sized Metal Head.
Appearances: MMPR/TMNT Issue 5
Metalhead
Metalhead is a robot turtle created by Donatello. Billy Cranston modified it into a Zord by modifying the miniaturizing ray to make it grow and it is capable of combining with the Megazord to form the Turtle Megazord. It can fire energy blasts from the "Turtle Cannons" on its left arm.