Troll armor is enough for the swamp. Just don't face tank anything. Most of the threats in the swamp are slow enough that careful back stepping can allow you to avoid all damage. Draug archers are dangerous with either bronze or troll armor, use cover or dodge the arrows. Use good food (2*HP, 1*Stamina) and you'll be fine either way as long as you are cautious and don't stay in the water for longer than necessary.