'The Celebrated Jumping Frog of Calaveras County' is an 1865 short story by Mark Twain. It was his first great success as a writer and brought him national attention. The story has also been published as 'Jim Smiley and His Jumping Frog' (its original title) and 'The Notorious Jumping Frog of Calaveras County'. In it, the narrator retells a story he heard from a bartender, Simon Wheeler, at the Angels Hotel in Angels Camp, California, about the gambler Jim Smiley. 
Jim loves to gamble and will offer to bet on anything and everything, from horse races to dogfights, to the health of the local parson's wife. He catches a frog, whom he names Dan'l Webster, and spends three months training it to jump. When a stranger visits the camp, Jim shows off Dan'l and offers to bet $40 that it can out-jump any other frog in Calaveras County...