I’m not familiar with the “parable of the turtle and the frog”. Sounds similar to Aesop’s Fable of the Scorpion and the Frog. Is It?
http://shortstoriesshort.com/story/the-scorpion-and-the-frog/
Getting a McAfee security warning on the link, but from what I could read before being blocked, it looked like the same idea.