From the Super Mario Wiki
The Hoohoo Mountain is a large mountain in the Beanbean Kingdom that the Mario Bros. visit in Mario & Luigi: Superstar Saga. The mountain is primarily inhabited by the Hoohooligans on bridges near a giant waterfall. 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" (used by Mario to become Pump Mario). At the summit lives Blablanadon, a talking pterosaur.
When Mario and Luigi first come here, they are mistaken for the one who kidnapped Prince Peasley, only for Tolstar, who had previously been beaten by Mario and Luigi, 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 completed after they met Fawful in the village.
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