It's called MyIdol in the app store. It turns you into a cartoon character.
It works by taking scanning your face and then creating a 3D avatar version of you.
You can then customize your look by choosing specific hairstyle, eye hairstyle, eye color, shirt, pants, shoes, and more.
The app then allows you to create crazy videos, GIFs, or pictures of your avatar performing, singing, or dancing.
Check it out and have some fun.