R..
Hmm. Kind of seems along the lines of the scented markers. lol. I personally doubt I would use them as a "here, you can lick the paint!" type thing... but say my toddler is just determined to eat her paintbrush... I would probably go for the edible variety rather than a toxic paint until she outgrows the phase.
Although, I have been known to let my DD finger paint her high chair tray with ketchup, mustard, and pickle relish. lol.