It should be 3 friendly matches in total (though some Greenland reports mention only 2 - there always has to be some sort of confusion).
Seemingly, the sport is more popular in Greenland, and hardly anyone plays in the Faroes. Another article from Greenland gave the squads for the match - Greenland has a 17-man squad, while Faroes are sending only 9 players (including 2 goalkeepers). As futsal has rolling subs, a big squad is quite handy. The article mentioned that some of the Faroes players would be unavailable, as they were playing against Malta (at football) on 19th November, and it appears the Faroes are basically sending regular football players to play futsal. I'm not sure playing against Malta on 19th would make you unavailable for matches that don't start until 29th.
Greenland has played with their junior national team at the Arctic Winter Games (they entered 3 events, and won silver medals in junior male & junior female and the gold medal in juvenile male categories), so they seem to at least have some tradition of playing indoors, which you might expect seeing the state of some of the outdoor facilities in Greenland, and the general lack of grass.
I think it would be better if it was a part of a general FA exchange - so men's and women's international football matches could also be held, and even beach soccer (if that is possible).