From the Super Mario Wiki
Fawflants are Fawful-like, drill ant enemies found in Mario & Luigi: Bowser's Inside Story. They live underneath Toad Town. In the overworld, they will start a battle by walking backwards toward Mario and Luigi with the drill in action.
In battle, they have two attacks. If two or more Fawflants are in battle, they attack Mario and/or Luigi at the same time; this can be countered by jumping. For the other attack, they simply walk backwards into one of the brothers, who will take damage and possibly be poisoned if they are hit by the drill. This move can be countered by using the hammer.
Also, in Toad Town Caves, Mario and Luigi will meet two Fawflants, disguised as Toads and acting as guards for Fawful while he's stealing the Dark Star; this also shows that Fawflants are capable of speech and shapeshifting.
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