Dieter Liederhosen is a German kid who attends Hazelnut Middle School and is in the same grade/classes as Pepper Ann, Nicky Little and Milo Kamalani. He appears in several episodes, the most notable being "To Germany With Love" in which he sends his father in Germany a video of his life in Hazelnut. Dieter moved to Hazelnut from Germany with his mother (who works as an obstetrician at the local hospital and delivered Moose) sometime around kindergarten ("The Way They Were"). In "Have You Ever Been Unsupervised" he has his 13th birthday.