Kids who grew up in the middle of the 20th century are much more likely to have had Brownies as toys than are kids who grew up more recently like me (hey, I had a computer!). Lots of kids also had Mickey cameras, cereal box leicas, or whatnot.
I'm not sure how much the modern "toy camera" are actually used by children in a learning/play context. Does anybody's 8-years old have a Holga?
I think I would use "lo-fi cameras" as an umbrella term for the class of real toys, Brownies, "toy" camera, chinese/russian crapboxes, Polaroid instant, oatmeal pinholes, etc, if "lo-fi" wasn't already coopted to sickness by the music industry.