In German it’s Mäusespeck = Mouse Bacon
I’m German and that is bullshit. Never heard of mäusespeck, everyone just calls them marshmallows and they are labeled as marshmallows in the store
EDIT: I was made aware that the Problem seems be that im not a boomer. 30 years ago, when i wasnt alive, they seemed to be called this. In my WG there are people over 30 though and they also never heard of this (hessen)
Where do you live? Mäusespeck is even in the Wikipedia article:
Im deutschsprachigen Raum ist die Süßware häufig unter der Produktbezeichnung Mausespeck oder Mäusespeck erhältlich.