Yes you can find Indians everywhere in Qatar but if you consider the % as 25 which I am not sure - out of these 25 % almost 24.5% are Keralites.

Cost of food is not the same like in other GCC countries specially if you compare with Dubai. In Dubai, there are more options apart from Keralite food like you will find many Indian restaurants serving North Indian food as well along with Recipes from other parts of India.