I wrote this tool (started on Thursday) called Doodle that is designed to give kids a quick drawing canvas. It's a super simple app that I made for my son who kept drawing over all of my Apple notes. You can draw, then press the button in the top right to quickly erase your drawing (Like an Etch A Sketch).
Someone nerd-sniped me and I added in the ability to record a video as well. Technically, you could use it to do quick 5-10 minute drawing/narrated lessons and export them for educational purposes.
Site: https://joeblau.com/doodle/