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.
There's an excellent pdf on the Tahitian ukulele here, some intricately carved examples here and a series of videos on how to play the Tahitian ukulele here.
The Sunshiners from Vanuatu perform AC/DC's Back In Black on Tahitian ukulele.