Southern part of Norway has a rather mild climate, and for the last decade or so we've had individuals and even small packs migrating from Sweden, which has had a warthog population for years. Nowadays the hog-population in Sweeden is booming. Oppinions are divided as to wether the hogs are welcome or not, and it's still considered unwelcome by the authorities, and you can pretty much shoot them anytime of the year, as long as you have an agreement with the landowner. Hunting trips to Sweeden are pop, not too expensive, and you get a considerable chunk of meat if you're lucky. Usually hunting from treestands on bait at night. Southern parts of Sweeden seldom see temperatures below 0°C, and it's rather flat agricultural land with rather big forrests areas. Deer population is also rather plentyful there. Pigs arent too picky, and eat them selves fat on beets, carrots, corn, basicly anything with calories.
Hunting trip provider in Norway: