Bless Facebook sidebar ads sometimes, because this was just too weird not to tell you guys about. A wooden tattoo machine, that holds a crayon, designed for kids and available from a few different sellers.
This is not a new thing, apparently, as a simple Etsy search showcases several listings for “handmade” wooden tattoo machines for kids.
Amazon of course has some options as well, but they’re more the high-gloss draw on your skin kind. (Although they do have actual working machines available too?)