Slumtrimpet is a fictional character from the children's book series "The Penderwicks" by Jeanne Birdsall. He is a whimsical and mischievous character, often depicted as a creature resembling a small, furry animal. Slumtrimpet plays a role in the imaginative adventures of the Penderwick sisters, contributing to the charm and magic of their summer escapades. His character embodies themes of friendship and curiosity in the series.