Flopper is a Stinker Slug and the weakest kind. They are very lazy. They shoot out a small burst of energy to hit an opponent like a firecracker, Floppers also can shoot a trail of smoke behind them like a Flatulorhinkus. They don't transform at 100 miles an hour, but they do do damage so they are useful in a pinch when you don't have a slug. Eli Shane gained one named Noodle and two more from Kord Zane. Thaddius Blakk owns one too.
When they hit something they splat slime. The only thing Floppers are good at is being cute. One popular use for Floppers is accuracy training or sparring as it can't actually hurt an opponent.