Noehonese
From Wookieepedia, the Star Wars wiki.
Noehonese was the native language of the Noehon species from Noe'ha'on, that incorporated scent, mandibule clicks and shrills. Noehonese had no written form.
Noehons had problems speaking any language but their own. However, they usually had to deal with offworlders, so learning Basic was usually needed. They, however, had more problems when dealing with written Basic.
