After Mario and Luigi defeat Tolstar in Stardust Fields, they are soon rushed by three Beanbean troops at the entrance to Hoohoo Village. They accuse the brothers of kidnapping Prince Peasley, but Tolstar fortunately informs the troops that they are indeed the legendary Mario and Luigi of the Mushroom Kingdom. The troops apologize, and mention reports that the perpetrator wore an odd helmet and mumbled about "mustard and fink-rats", which turns out to be Fawful.
Beanbean troops are stationed at Beanbean Castle and the outskirts of Woohoo Hooniversity. Authorization is required to pass these areas, which is granted by royal decree.
Mario & Luigi: Superstar Saga Official Nintendo Player's Guide:Beanbean Castle's guards may not be the brightest beans on the vine, but they're fiercely loyal to the queen and her people. If you're not authorized, they will not let you pass.[5]
^"They attacked while the Beanbean troops were in Hoohoo Village searching for Prince Peasley..." - Beanbean Castle Town NPC, Mario & Luigi: Superstar Saga.
^"Durable slacks worn by Beanbean troops." - Heart Slacks description, Mario & Luigi: Superstar Saga.
^"Sturdy gear worn by Beanbean soldiers." - Tank Badge description, Mario & Luigi: Superstar Saga.
^"When the Bros. first enter the area, Beanbean knights surround Mario and Luigi, mistakenly believing that Mario and Luigi kidnapped Prince Peasley, a Beanbean royal family member." - Stratton, Stephen, and Levi Buchanan. Mario & Luigi: Superstar Saga Prima's Official Strategy Guide. Page 56.
* Exclusive to Mario & Luigi: Superstar Saga. • ** Exclusive to Mario & Luigi: Superstar Saga + Bowser's Minions. † Enemy, boss, or stat exclusive to the main game. • †† Enemy, boss, or stat exclusive to Minion Quest: The Search for Bowser. • ††† Enemy variants differ in Mario & Luigi: Superstar Saga + Bowser's Minions.