Norwegian has several loanwords from English. Some are pronounced differently (such as "juice"), while others use the English pronunciation, but sometimes with a Norwegian ending. The latter is more common among the youth.

Another example:

"Denne eplejuicen er helt fucka / føkka"

-> This apple juice is fucked up.

Gamers often talk about "lev'le opp" ("level up") for example, but it's not used that often in its written form. It just looks strange to me. Sometimes they even replace a Norwegian word such as "oppgradere" with its English equivalent ("upgrade"), but pronouncing it in a mix of English and Norwegian.

I wonder where the b in sein conjugation came from?

  are (v.)
  present plural indicative of be (q.v.), from Old English earun (Mercian), aron (Northumbrian), from Proto-Germanic *ar-, probably a variant of PIE *es- "to be" (see am). Also from Old Norse cognates.

https://www.etymonline.com/word/are

> The conventional wisdom is that it's easier for an English speaker to learn Swedish than it is to learn German.

If we consider pronunciation then closest is probably Danish. As English pronunciation seems to be alien to most European languages.

Not Danish. Danish is pretty alien. Norwegian is quite easy for an English speaker, plus all the dialects mean that even technicalities such as the tone accent can be "worked around". Swedish and Norwegian are both pretty easy to pronounce and pretty easy to learn as an English speaker. Most of the problem is vocabulary, not really so much the grammar.