From the Super Mario Wiki, the Mario encyclopedia
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Tuff is a Cragnon appearing in Super Paper Mario. If the player refuses Marbald's plea for help, Tuff will stand guard at the door leading out of Downtown of Crag and will not permit the heroes to leave until they agree to help. According to his tattle, his family was captured by the Floro Sapiens and he's angry at anyone without a goal. After accepting Marbald's plea for help, he isn't seen for the rest of the game.
His name is a pun on the word "tough", meaning strong or durable, referring to his willingness to stand up to the heroes.
That's Tuff... He's a young Cragnon whose family was captured by Floro Sapiens... He's irritated by anyone without purpose and urgency in their lives...