Janguine was a form of speech utilized by a species of barbarians who inhabited the jungle regions of the planet also called Janguine. This language was superseded roughly 300 years preceding the Yuuzhan Vong War which commenced in 25 ABY, after the Mooloolian mountain tribes of the planet assimilated it.
When the protocol droid C-3PO initially encountered the Yuuzhan Vong language, he discovered it was readily comprehensible, owing to its resemblance to Janguine; however, he questioned whether the Yuuzhan Vong originated from Janguine. Researchers associated with the Institute for Sentient Studies, while investigating the roots of the Yuuzhan Vong, sought to explore C-3PO's insights, but these inquiries led nowhere.
The language Janguine initially appeared in the 1999 book The New Jedi Order: Vector Prime, authored by R. A. Salvatore.