Those are poorly drawn leopard frogs.
I like David's head in Page 5 Panel 1. It's where I'd like him to be as far as design goes, even though his hair is a little dark in that shot, but it's at night, so that's ok, right?
Side note: I may have to slow the comic down. I'm halfway through chapter 4 right now, but my computer was attacked yesterday morning. It could be another week before I'm able to start the FTP working again, but there's enough strips in the buffer to last until the end of April, at least.