@wmd @Blumenkuebel @muellertadzio
So, i checked just the first few results of a web search.
https://www.numbeo.com/food-prices/country_result.jsp?country=Norway
https://www.globalprice.info/en/?p=norway/grocery-food-prices-oslo
https://www.expatistan.com/cost-of-living/country/norway

From these websites it appears that meat is quite more expensive than vegetables.
Chicken (an inexpensive meat) costs around 4 times as much as tomatoes (an expensive vegetable).
Fish is more expensive than chicken but less than other meat.

Of course this is aggregate data, so you can probably find some cheaper meat if you're looking for that.
Anyways, it looks to me that eating meat in Norway is even more expensive than in Italy compared to vegetables. In Italy you can get chicken that costs the same as tomatoes.
Prices are higher overall, but the price disparity between a vegetarian diet and a meat filled one appears to be the same if not even higher.
Definitely there might be some particular places in which fish is cheaper than vegetables, or maybe even meat for some strange reason; but this doesn't appear to be the norm.