backyarder, noun
backyard dweller. Also attributive.
2011 J. Stephen in Elle Decoration No.75 Feb. 28 (caption)‘Land and Liberty’, inspired by an image of protesting backyarders, is on Keizersgracht Street in Cape Town – the spot where people traditionally gather when marching to parliament.
2017 dailymaverick.co.za (DSAE Corpus)The Witzenberg Municipality has apologised to a group of backyarders whose shacks and some belongings were destroyed during an eviction in Wolseley last week...
backyard dweller. Also attributive.