The Boy with Green Hair(1948)

Please don't tell why his hair turned green!

Peter, an orphaned boy, is adopted by Gramp Frye after his parents are killed in Europe while doing war relief work. The boy feels safe with his new caretaker, but when he is taunted for being an orphan, he gets demoralized. The next day Peter wakes up with green hair. Embarrassed and further ridiculed, Peter seeks solace in a nearby forest. To his surprise, he finds other orphans in the woods, who encourage him to spread news of the injustices of war.