I want to know the answer to the following question:
What had been thought for a while to be an independent ancient Greek precursor to Twain's story?
All the background I'm provided with is that "Mark Twain provided humorously telling evidence for the frequent unreliability of back-translation when he issued his own back-translation of a French translation of his short story, "The Celebrated Jumping Frog of Calaveras County".". Is that enough to answer the question?