Terrapin
Terrapins are armored Koopas with green shells and are one of the weakest minions in the Koopa Troop, even weaker than the lowly Goomba. They attack their opponents by punching. (However, this does not do much damage.) Terrapins fight solo, or in groups of two to four. During the events of Super Mario RPG: Legend of the Seven Stars, Terrapins patrolled the halls of Bowser's Keep in search of intruders.
For some reason, perhaps because they were the very first enemies Mario fought, the music while battling them remained the same as when not battling, instead of changing to the battle music. Also, they gave Mario no experience points.
Terrapins are the precursors to the Koopatrols of the Paper Mario series.
The word "terrapin" is an ambiguous term referring to turtles, which Koopas are of course.
