Quoting Dave Kaleta
Okay, the film was really well done, but I must admit to giggling a bit when I heard the Trandoshan speak :) ~Dave
I literally wrote in the script: Trandoshan=(gibberish sounds)
The Trandoshan's voice was accomplished by recording my "snarling" growl and then playing it in reverse with some minor pitch editing. Easier said than done ;)