Also, Linda Ventriglia did a classic study of Mexican children in
"Conversations of Miguel and Maria" which looks at language play.
In northern Mexico there is an oral tradition called "albures" which is a
verbal dueling oral tradition that I feel represents the verbal prowess
duels of Chicano youth. Americo Paredes at UT Austin was the most famous
folklorist working in this area.
Our own classical oral tradition in America is the "Dozens" and it is alive
and well today among Black youth. You can look at the short stories of
Langston Hughes called Jesse B. Simple for excellent examples.
That's all for now off the top of my head. roberto