Yay, I am relieved to find out that's what it is. I thought he might have worms or something, what a relief!
I was handling him, and I noticed something sticking out, and that's what it was. He is a pretty unstable, skittish snake, so maybe it was "expelled" because he was nervous? I was only handling him because he had to be soaked, since I was double-checking that the ticks were gone (which they are, big sigh of relief there.) Thanks for the great pic K!