Diogenes wrote:To me, the German ö sounds much more rounded than the Norwegian ø.
drøm sounds American English drum

with a different rhotic
Although I would not say this is true. The vowel in drum is unrounded, while drøm is rounded and a little more to the front.
I only hear drøm as unrounded in Oslo accent.
This is what the author of ''The Phonology of Norwegian '' (Gjert Kristoffersen) says after the acoustic analysis of Norwegian vowels has been made:
That [œ] and [ə] have identical values is somewhat unexpected...[ ]...
Tromsø ~ homse ‘homosexual (coll.)’. This pair would not normally be considered as rhyming, but this may be due to convention and spelling.
The author himself is surprised when the results of acoustic analysis came.

I guess /œ/ [ɜ] in Norwegian is just like /ʌ/ [ɜ] in American English.

or /ʌ/ [ɐ] in British English...The phonetic pronunciation has moved away from the phonologic pronunciation.
