People don't study folklife like they memorize spelling lists. Probably other children, either playing at home or at school. You see, children form a very large social group, which has its own games, stories, and sometimes rules of conduct. Older children teach younger children the words to the rhymes or younger children learn by watching the older children. Sometimes children invent new rhymes and then pass those down to other children.
Teenagers are their own cultural group.
In fact, teenagers who attend the same high school can sometimes be thought of as members of a cultural group, who share traditions, legends, and customs. The same joke is pulled on new freshmen year after year as students learn the joke from their classmates and friends. In academic circles, this is called an oral tradition. It takes all kinds Students also belong to other groups, like your family, your community, your church, an ethnic group, a regional group. There are lots of other types of folk groups, but the idea is that in these groups people share some traditions, customs, and beliefs that are passed down.