Cool posting, Bruce. I get excited when I hear about someone who got excited about stuff I have written. No, there are only two Snarkout books. What people don't always realize is that authors like me don't just get to do whatever they want. I had another Snark book in mind, ""I Snarked with a Zombie,"" and might have done more yet, but publishers often come up with something like, ""We're making 8% more money on picture books, so we won't give you a contract for a novel.""
Publishers are often on the stupid side. Meanwhile, have a look at ""The Education of Robert Nifkin,"" a novel. It's a little bit like the Snark books, in some ways, maybe.