I freaked out over those things once before and went on a rampage trying to figure out if it was the remnants of some sort of parasites or whatever. I don't know why I had never seen them before as many years as I've been keeping snakes. Shows how observant I am sometimes.
It's tongue sheds. They shed the skin on their tongues just like the rest of their body. Each one of those thingies is the shed skin from one fork of the tongue. Now that you've seen them, you'll notice them in other snake's cages, too..scaled to the size of the snake.
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We do not inherit the Earth from our ancestors; we borrow it from our children. Ralph Waldo Emerson