Yes, although you could stay longer ...you will always be 'safe' if you are out of the US for less than 90 days at a time.
Have a great trip ... say hello to the Gudbrandsdalen Valley for me and my ancestors. Yes, although my name is Italian, part of my blood is Norse.
Yes you can, just don't forget to come back befor 90 days. Also do not commit any crimes in Norway, they can be held against you in the USA. Wishing you the best.
Frank Stanczak
Immigration Attorney
No, you cannot travel to Norway for any period of time with your green card. For that, you would need a valid passport or travel document as well as transportation fare. You CAN indeed return to the USA with your green card from that trip of two months in Norway.