MonsterGuy, with the exception of one single shot (the scene of the nearly-static sauropods lolling in the swamp, which is from Unknown Island) all of the dino footage in Teenage Caveman is recycled footage that was created in association with the 1940 classic, One Million B.C.   I say "in association with" because very few of the scenes in Teenage Caveman are actually found in One Million B.C. -- most of the shots are of the test shot/outtake variety, which also ended up in the stock footage library and were often tapped for ready-made dinosaur scenes.

A previous thread that discussed this very topic can be found here:
http://monsterkidclassichorrorforum.yuku.com/topic/20226/Unknown-Island?page=2

... the discussion spans posts #22 through #38.