Tahitian ukuleles are very different from the standard Hawaiian ukulele. They are solid bodied, and have eight strings (in pairs tuned like a standard uke). They are also always intricately carved: dolphins and turtles seem to be popular themes. They have a much sharper tone than standard ukuleles (closer to a banjolele). The sound of them is probably most recognisable from the Arrested Development theme tune.
The Sunshiners from Vanuatu perform AC/DC's Back In Black on Tahitian ukulele.
Tahitian Ukulele Tahitian Banjo