I spotted on the www some miscealanous stop signs here and there from various Indian reservations in Canada
This one located in Winneway, Quebec in the Temiscamingue area
http://www.solutionsnursing.ca/p-19_photo-prise-a-winneway_1_1_2.html
in New-Brunswick in MicMacq language
http://fr.wikipedia.org/wiki/Fichier:MiKmaqStopSign.jpg
Stop sign in Cree language, one only Cree and another bilingual French-Cree
http://www.flickr.com/photos/jthumult/1260929144/
http://www.bmwmoa.org/forum/showpost.php?p=284364&postcount=23
Natuashish First Nation, Labrador:
(https://lh5.googleusercontent.com/-uucZD0QURw4/TQO52x7uCpI/AAAAAAAAG-Y/ymKDZME9p4A/s800/DSC05808.JPG)
Kahnawà :ke has bilingual English/Mohawk stop signs (STOP - TESTAN), but I can't find any Street View coverage for them.
Route 138 also has HOV lane signs in Mohawk in that reserve.
I may have posted this before, but here's a Cherkoee STOP sign in Tahlequah, OK
(https://www.aaroads.com/forum/proxy.php?request=http%3A%2F%2Ffarm4.staticflickr.com%2F3105%2F3221907520_4e47544bee_z_d.jpg&hash=2953bba9575caf8f52faef1fcb8a8e3353b29a75)