They did not.
I wouldn't put it past some stooges to try it.
Global warming deniers should snag the Gieco cavemen to impart and educate the populace on the Global warming hoax. They could have that effect without calling it a hoax. Also, they could do mortal combat with the enviro-whackos.
It's like shooting fish in a barrel. Too easy.
Interviewer: Tell us caveman, how does today's world stack up to that of your early ancestors?
What's he going to say? "You want me to say that modern man's technology is causing tremendous harm and hardship for the hunter-gather caveman. Cavewoman and cave-children hit hardest."
Caveman: Yeah right! Like that's goanna happen -- NOT! Sipping mint-juleps poolside is such a hardship. Where do you people come from?!