The short back story on this is that a couple of days after I came down with tonsillitis, Caroline was checking her throat to see if she'd caught it. She was looking into the mirror with a flashlight and gasped telling me to look at something. I did. I was terrified and yelped a bit. She had a second tongue!
As it turns out, it's actually a high-rising epiglottis, but it's pretty damn weird looking.