YA(?): kids up to no good featuring foiled cabbage and sassafras trees

Something I read in grade school, could be a full book or short stories.

But the bit I remember the most is kids wrapping rocks in tin foil and selling it to people as cabbage

Another piece I remember is the kids sticking apples onto the end of a branch of a sassafras tree and pulling it back to slingshot the apples from the top of a lookout.

Thanks for any help!