Childlore is folklore passed directly between children, without the input of adults.
https://en.wikipedia.org/wiki/Childlore
Stuff I can think of off the top of my head are paper fortune tellers, summoning Bloody Mary/the candyman, the cool S, parody songs like “Jingle bells Batman Smells” and “Joy to the world, the teacher’s dead” etc.
This stuff has intrigued me since, well since I was a kid. I always wondered where they came from. I never saw adults doing that stuff, so I figured another kid had to have come up with it.
The version of the Little Einsteins theme song i would sing in middle school and high-school everytime we went on a field trip on a school bus
We’re going on a trip, in our favorite piece of shit! Doin’ 95, we’ll probably fucking die!
The teachers hated it but a bunch of the other kids thought it was funny and would sing along
But really though, have you ever ridden on the highway in a schoolbus during a fieldtrip? This is absolutely what it felt like, that you were going 95 mph with no seatbelts and you were gonna die