Yes, these are cartoons. Why not? These particular cartoons mine a rich vein of artistic material. I mean if you think about it, a lot of 20th century art is really funny.
Check his website/blog (www.marcjohns.com) and there's few more things at Artdoxa.com
An explanation by the arist:
"A nod to Rene Magritte, Damien Hirst, and all of my art history professors.
I've always been interested in how art is analyzed by critics and historians, and wondered if the artist ever gave it as much thought as they did. I like to be helpful, so I thought I'd provide a clue for anyone analyzing this one."
included because I cannot resist any reference to Bigfoot or Yeti.