Granma Dumbrel was an old mole who lived in Rogg Longladle's cavern. She was the wife of Granfer Clubb. When Dorothea Duckfontein Dillworthy arrived in the cave with her companions, Granma Dumbrel and her husband were very pleased to find that the former spoke in the mole dialect. She was a very minor character as she was mentioned only once.