悪童[akudou] bad boy
河童[kappa] kappa (mythical water-dwelling creatures)
河童巻き[kappamaki] cucumber sushi wrapped in nori (seaweed)
学童[gakudou] school child
お河童[okappa] bobbed hair (from resemblance to the mythical Kappa's hair style)

三尺の童子[sanjakunodouji] mere child
児童[jidou] children
児童画[jidouga] pictures drawn by a child
児童劇[jidougeki] juvenile play
児童心理学[jidoushinrigaku] child psychology