Here's a better image; the last one didn't show the underside of the head very well:
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The nose is used as a snorkel, and along with the cryptic coloration, allows mata-mata turtles to breath in shallow streams and marshes without breaking cover; they are ambush predators that like to feed on small fish, similar to snapping turtles. Softshell turtles, although belonging to a separate suborder (mata-mata are in suborder pleurodira and softshells are in suborder cryptodira) have the same "snorkel-snout" adaptation, and use it the same way:
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I really like the top pic. He looks like he's smiling! So cute! Another thing Turtonator could learn...