Maybe add a way to poison the whole swamp that prevents any more creatures from spawning there again, like we have with fungaloids and whatnot. If it’s going to be ‘spawning pools’, you should be able to pour a big bucket of pesticide into it and wipe them out, it’s not like the EPA is around to stop you. Something along that lines, just so you have an option to make a swamp safe if the player really, really wants to live there for some reason.
Speaking of which, there should maybe be more reason to go into swamps, right now all it has are things that kill you. Perhaps some sort of ‘end-game’ location should exclusively spawn there. In real life, swamps are one of the best places to be in a survival situation because there are so many delicious creatures wallowing about in the muck. I guess this is still true in the game assuming you are not eaten first.