From the Super Mario Wiki
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Peas are similar to Princess Peach's Toads. They serve Queen Bean in Mario & Luigi: Superstar Saga. Peas are Beanish and they're numerous within Beanbean Castle. During the events of the game, they're captured by Cackletta and Fawful and placed in the Beanbean Castle Sewers. In the intro of Mario & Luigi: Superstar Saga, Cackletta's follower, Fawful was disguised as a Pea to fool Princess Peach (although Birdo was disguised as the princess at the time).