[This is a generalization of Josh B.'s question]
Star Trek's Klingon, Game of Throne's Dothraki and High Valyrian, Tolkien's Elvish, Dwarvish, and even the black speech, and more, are fully developed languages that you can learn to speak if you
have way too much time on your hands are curious enough.
Are any languages in the Star Wars universe similarly developed to the point that you can learn to speak them?
(Josh B.'s original question was about Shyriiwook and translating un-subtitled dialog by Chewie, but I'll open it up to any language with on-screen spoken dialog)