I think these are roasted crickets. I saw a couple of vendors in downtown Yangon. Didn't try any.
[2015 update: at tourist sites in Vietnam you'll occasionally see roasted spiders for sale. The Vietnamese ate these when they were starving during the Vietnam war, but don't eat them now - they just sell them to tourists who like to be able to say "I ate a spider." Roasted crickets are for sale all across Myanmar, and the target audience is locals, not tourists.]