Digga

Diggas are enemies that can first be found in Spin Dig Galaxy in Super Mario Galaxy 2. They resemble yellow Bullet Bills that have drills attatched to them. Their attack is digging through the ground, trying to hit Mario with their drills. They can easily be defeated by jumping on top of their heads, or being hit by a Spin Drill.

Trivia

 * "Digga" most likely means "digger".
 * The reason they are called "Diggas" is because they dig through the ground.
 * Diggas might be minions of Digga-Leg because he can summon them.