The Troopea's appearance is similar to the Koopa Troopa, but a green sprout sits on their head and they have blue shells. They also have stronger variants called Elite Troopea, Paratroopea, and Scaratroopea. Their undead variant may be the Beanish Dry Bones, although this is unlikely since those foes are quadrupeds, even in the remake.
Mario & Luigi: Superstar Saga
Troopea debuted in Mario & Luigi: Superstar Saga as an enemy in Beanbean Outskirts. In the remake, they have are bipedal like the generic Koopa Troopa.
In battle, Troopeas only have two attacks, which is trying to ram into one of the brothers. However, Troopeas can also heal their allies in combat by launching a water droplet onto them. Troopeas recover their allies or themselves with a water droplet. They can dive under the Bros.. If the target does not jump, the target will deal damage.
Troopeas appear as enemies in the side story of the remake, Minion Quest: The Search for Bowser. They first appear in Turnip Tantrum. They fight as melee troopers, and their Special Skill is Rock Solid.
Troopea is a combination of the words Troopa and pea, hence being the Beanbean Kingdom equivalent of a Koopa Troopa.