The status of Norwegian Nynorsk is reminiscent of Yue/Cantonese. In areas where it is native, it’s used in writing more rarely (and very rarely in official writing) compared to Mandarin (a distinct, not mutually intelligible language) or English. Another similarity is that Cantonese, like Nynorsk, is considered higher status where it’s spoken, and like Nynorsk it’s under somewhat of a threat so the communities know t…
In addition to what vidarh said - it's not comparable to Mandarin vs Cantonese, as those are spoken languages. Nynorsk is one way of writing (and reading) Norwegian, it is not a spoken form (nor is Bokmål). Some dialects are kind of closer if you try to "speak" it (read out loud, from e.g. a book), and some are farther away, most dialects contain elements where some words will fit better in one form and other element…
I think what goes for "German" has even more internal differences.