From the Super Mario Wiki
The Hoohoo Mountain is a large mountain in the northern part of the Beanbean Kingdom that the Mario Bros. visit in Mario & Luigi: Superstar Saga. The mountain is primarily inhabited by the aptly named Hoohooligans on bridges near the giant waterfall cascading from the top. Their ancient civilization can be seen throughout the mountain, including their jokes inscribed on the rock walls (in Hooroglyphs), their weapon Hoohooros, and the "watering holes" which are actually man-made fountains (used by Mario to become Pump Mario). At the summit lives Blablanadon, a talking pterosaur. To the northeast of the mountain are the Stardust Fields and beyond them, the Mushroom Kingdom.
When Mario & Luigi first came here, they were mistaken for the villains who had kidnapped Prince Peasley, only for the injured Tolstar to appear and clear their names. One of the bridges was also being repaired at the time of their arrival, and repairs would only be completey after the Bros. met Fawful in the village.
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