The Olmecs, for those unfamiliar with Precolumbian Mexico except through watching episodes of "The Simpsons", lived mostly in the present day Mexican state of Tobasco, which is on the Gulf of Mexico in the south. The Olmecs, who predated the far more famous Aztecs and Mayans, are known for their colossal heads.
Not that actual Olmecs had heads that large, but they certainly liked carving them.
And what did the Olmecs give to civilization? Zero.
Literally. The Olmecs are generally considered to have introduced the concept of zero.
The Simpson family received a giant Olmec head in the episode "Blood Feud", which originally aired in 1991. Mr. Burns bought the head at "Plunderer Pete's." The writers gave the head a made-up name which sounded more Nahuatl (aka the language of the Aztecs). But we don't really know what the Olmecs spoke. And the colossal heads aren't talking!
Los Olmecas (yes, the article and noun agree in gender) don't use the colossal heads as their logo as you can see in their website linked above, although the heads do show up if you mouse over some of the links.
However on this site, there are older versions of Los Olmecas logos and they did incorporate the colossal heads. Were the colossal heads dropped because they wanted to avoid the mess of a Chief Illiniwek controversy? Or was it just hard to get someone dress up as a 20 ton head?