Yup that's what it is. It is one of their Stone-Age cartoons that came out in 1940 inspired by the success of ONE MILLION B.C. They were created by Max Fleicher's animation team. Their cartoons predate THE FLINTSTONES so expect to see a lot of modern stone-age humor. In a nutshell, this cartoon is a prehistory retelling of The Ugly Duckling, except it had dinosaurs and had saber-toothed tiger as the villain. While the gags are good, it is a great cartoon worth watching. Not rated, but a G will work.

During the Late Thirties, with the Production Code bowdlerizing Betty Boop, the Fleischers kept trying to expand their regular series beyond Popeye and Screen Songs. They tried with Wiffle-Piffle, a relative of Termite Terrace's Egghead, but he didn't go anywhere. In 1940 they tried to do a bunch of Prehistoric-themed cartoons, perhaps influenced by reports of Disney's Fantasia. Running to dinosaur-and caveman gags, it was called the 'Stone Age' series. This is the sixth.It is, as you might guess, a variation of the Ugly Duckling Story. It is rather sentimental for Fleischer, but the gags are numerous and well-constructed, as you might expect for a cartoon directed by Dave Fleischer. The result is a watchable, if not great cartoon.