There are many meaning of the Norwegian term "knulle". This term is slang an English swear word, one would be able to find more information on this term by checking a dictionary.
croft
The translation of the Norwegian word "spele" into English is "Play". The word does not appear to exist outside of the Norwegian language, and as such is the only available translation.
I would presume it is 'round burner' as 'rund brenner' means that in German.
Fossefall
there is no such word.
The English translation of the word "credo" is "I believe."
The English translation of the word "Allah" is "God."
Thank you "Tak" is the Norwegian word for roof or ceiling. "Takk" means Thank You.
The translation of the Spanish word "ser" to English is "to be."
As a substantive; an agreement, an appointment, a deal. As a verb; to agree, to make an appointment ("gjøre en avtale"), to make a deal.
Landslide inventory
At Ordboker online they say the English translation of the word Studera means - to study. This is a translation from Swedish to the English dictionary.