Canva's Comic tool, with loads of great templates is fantastic. Start from a layout and you can drag in your graphics.
In this article, John Swogger shows how cartoons can be used as a way of giving public audiences a better idea of what their work entailed.
I'm a firm believer that no matter what you are working on, that simply attempting to communicate it in a medium, perhaps one you aren't familiar with is a worthwhile exercise.
A wonderful collection of older strips, many of which are public domain.
For fun, you might, control(mac) or alt(click) to save them to your computer and edit them with Pixlr to add your own words.