You may not be old enough to know what a Hooverville is, but surely you understand the meaning of shantytown.
And now, American has begun to spawn largescale shantytowns on the outskirts of major cities. The BBC reports on a homeless tent city in Ontario, CA, just outside of Los Angeles. We can thank our president for making us part of the third world.
And what shall we call them? Bushtowns? Bushland? Bushgardens (oh, that one's taken). I kinda like the sound of Bushburghs.