Carrot Soup, Neck tail and Cooked meat are the best you can really have when you FIRST get into Swamps. When in the Swamp look for Turnip seeds and guts from draugr. You want to get Sausages and Turnip Stew as those are the two big new food types.

Get out of Troll Armor ASAP, get inside a Crypt and start getting scrap iron.