From the Super Mario Wiki
Moltz the Very Goonie
Moltz the Very Goonie is the mid-boss of World 5 of Yoshi's Island DS. Initially, it is a normal Hefty Goonie who is enlarged by Kamek's magic. Moltz is also the only Hefty Goonie that appears in Yoshi's Island DS. He tries to crush Yoshi by belly-flopping on him as they both freefall from space. In order to beat Moltz, Yoshi must Flutter Jump above him, while avoiding his flailing wings and projectile feathers, and do a Ground Pound on his head. After Moltz is hit, he flies and tries to attack Yoshi by sending Rocket Guys that Yoshi must avoid. Eventually, Moltz comes back down and Yoshi must hit him on the head again. If Yoshi failed to hit Goonie's head, his death cannot be avoided. After Moltz is hit on the head three times, he is defeated.
Names in other languages
Biggu debu ahōdori
|Big Fat Goonie
||"Mollo" is a given name derived from Moltz; "Albatro-Gros", a portmanteau of "albatros" (albatross) and "trop gros" (too fat), is the French name for Hefty Goonies.
||"XXL-" is a prefix referring to "extra extra large" things; "Birdie" is the German name of the Goonies.
- Moltz's name comes from the word "molt", when animals shed their old skin, feathers, fur, etc.
- All levels after Moltz's Tower until 5-8 contain Skeletal Goonies, implying that once Moltz was defeated, all Goonies might have become undead.