Is there a 3rd tumtum and nutmeg?

As of my last update in October 2023, there isn't a third book specifically titled "Tumtum and Nutmeg" in the original series by Emily Bearn. The series consists of two main books: "Tumtum and Nutmeg: The Adventures of a Mouse and a Rat" and its sequel, "Tumtum and Nutmeg: The Further Adventures of a Mouse and a Rat." While the characters may appear in other stories or adaptations, the main narrative remains contained within these two titles.