i dont have any tires, but to scratch that "skid the tire" itch for them maybe you can teach them this drill i learned from my NICA coaching. Also teaches good handling skills.
find a flat open surface maybe a grass field (or even your yard i guess) and put a decent size piece of cardboard on the ground. have them pedal at a decent speed and grab the brake when the rear wheel touches the cardboard. Once they get good at it, reduce the size of the cardboard they can focus on accuracy or you can also measure how far they can carry the skid without tipping over.
this should save some tires and also less road rash injury risk aside from the shredded grass. I thought there was a video somewhere of this drill but I can't find it.
@Robin did i remember that drill correct - please correct me where needed.