From the Super Mario Wiki
Retrieved from "https://www.mariowiki.com/index.php?title=Chombone&oldid=2399699"
A Chombone is an obstacle that highly resmebles the giant white louse in Mario & Luigi: Bowser's Inside Story. They are found semi-rarely within the Pump Works, located in Bowser's Body. They are needed to be able to get through the area to find out why Bowser cannot breathe fire. In order to activate them, they need to have food in front of them. Using pipes, the player needs to maneuver the purple star-like orbs in front of them. Without water flooding the area, they are unable to move anywhere. With water, however, they are can be pushed around freely until they hit an end. Doing so will allow the orbs to fall in line with the chombones, enabling them to eat the food, but as the orb seems to be extremely spicy, they will violently react by charging in a straight line, breaking through anything that can be broken - such as small bones. As a result, it'll allow both Mario and Luigi to pass through newer areas they couldn't before.
There are two different sizes of Chombone. The first is the more commonly found that can break through small bones. The second is more massive than the others, with only one in the entire game. They will charge through even thicker materials that block the way. They also are wider, clearing out a wider range of materials.
Names in other languages