I see Cruise Critic continues to live up to its reputation 😞
I have the Rick Steves Scandinavian & Northern European Cruise Ports and it covers:
Oslo, Stavanger, Bergen, Flam, and Geirangerfjord. It teaches you all about Norway in a Nutshell in Flam. I recommend it.
It looks like there a couple of Amazon that could be interesting. They include:
THE MAGIC OF CRUISING NORWAY 2022-23: Including a Russian Arctic Supplement
and
Cruising the Norwegian Fjords, from Amsterdam to Southampton : Abbreviated Guide for Cruise Ship Passengers
I just bought these two guides a minute ago as they were $7 and $4. (Kindle versions) Samples looked ok but can tell you more about these two later.