Swedish term (edited): pingelkringla

As a Swedish speaker, I can at least explain the source term: although you won't find it in any dictionaries, the term "pingelkringla" is a term of endearment, predominantly feminine. I would assume it is derived from the term "pingla", which as a verb means jingle/tinkle, but as a noun is a term of endearment for a girl/woman (cf. Norstedts' "chick, doll"). As you can hear "pingla" and "kringla" rhymes, and "kringla" in Swedish is usually a sweetbread (not a pretzel, although it is true that it is used for this salty variant too), so it comes naturally to mind as a nickname (think "sweetiepie" etc.).

I would suggest translating it to something equivalent in English, like "tinklebell" (which would give the impression of a fairylike feminine being, and preserves the "pingel" from the Swedish term). You could also focus on the sweetbread and go with "sweetiepie" or some other wellknown term of endearment in English.

(Btw, the term is most often spelled "pingelkringla" rather than "pingelskringla", although you will hear both variants in the spoken language.)