Pinocchio Frog
This tree frog's nose may not grow when it lies, but the northern Pinocchio frog does have a single, fleshy spike right smack dab in the middle of its face. At first, herpetologists thought that the nose was used to attract mates, but there hasn't been any consistent evidence supporting this theory.
Unknown Origin
Another possibility is that the spike helps to differentiate species of frogs in a densely-populated forest. 450 species of frogs have already been categorized, but many more have yet to be discovered.
"I tend to favor the second theory," says herpetologist. "But the truth is, like so much in biology, we really don't know.