Getting dozens of hyper kids to behave is usually the job of a teacher. Recently, though, two leading hip-hop choreographers who go by the name of Nappytabs took an unlikely stab at the daunting task.

ABCMouse is an online learning program for children ages 2 to 8 years old that’s available on iOS and Android devices. ABCMouse has thousands of activities that teach subjects such as math, reading, ...