Presently around the Swabian-Alemannic "Fasnet" we can often read of "Butzenzunft", or "Butzenlauf", or "Butzen", obviously referring to people in traditional costumes.
Image showing a "Butzen" Wikimedia
There are some other references to this word e.g. in this children's song:
Es tanzt ein Bi-ba Butzemann
In unserm Haus herum, dideldum,
Es tanzt ein Bi-ba Butzemann
In unserm Haus herum.
The swabian term for an apple core "Apfelbutzen" may also be related.
I am wondering if this is an entirely regional word from alemannic dialects, or if it has a wider etymologic origin lost over time in other German regions. Is there anything known on the origin and meaning of "Butzen"? Did it survive in any other related German expressions?