From the Super Mario Wiki
Tub-O-Troopas are Koopa Paratroopa enemies in Super Mario RPG: Legend of the Seven Stars. Tub-O-Troopas are obese, chubby Koopa Paratroopas with green shells. They have smudged noses and puffed-out cheeks, as expected, as well as their enormous bulk, which is the major reason for their high HP. They are found in Bowser's Keep. They are very similar to Heavy Troopas, even fighting exactly the same, and resemble winged Ankoopas (the latter is from Mario & Luigi: Superstar Saga). The game even refers to them as Heavy Troopas when it states "Heavy Troopa's ready to launch." They appear to be based on Colossal Koopa Paratroopas from Super Mario Bros. 3.
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