1958 saw Corman expanding his range a bit, to sometimes dubious results. Aside from his Viking epic he made Teenage Caveman, with the weirdly suave Robert Vaughn (shades of George Hamilton playing Evel Kneivel) at 26 playing the titular hero. The film has a Rod Serling twist at the end.
Was there a (presumably stock footage) dinosaur in the film? I don’t remember, frankly. The monster suit is in there, though.