Pimpfe
Pimpf is a German nickname for a boy before the voice change. It is a colloquial word from Upper German meaning "boy", "little rascal", "scamp", or "rapscallion".
During the period of German National Socialism, Pimpf was a term referring to a member of the Deutsches Jungvolk, the junior section of the Hitler Youth in Nazi Germany, for boys aged ten to fourteen. The children were taught to be loyal to Hitler and the regime. Membership in the Hitler Youth was highly encouraged and incentivised during the mid to late 1930s and compulsory from 1939.
Nowadays, the term is not often used and is not at all associated with National Socialism.