Oh boy. He's quite the little scavenger, isn't he? Forgive my cultural culinary ignorance, but what exactly is endamame? Also, what does your dog weigh and how is he behaving this morning? Any change in bowel habits thus far or any sign of bloating?
Edamme are soybeans in the pods.
I think your dog should be fine. I'm not sure though, so don't take my word for it. But considering that edamme pods are basically just ruffage, I think the worst that might happen is loose bowel movements. However, you should probably call your vet and ask if you should have any concern of intestinal blockage in your dog. I think he should be okay, though. My dogs and bird like to eat the beans, but I can't say they've ever eaten the pods.
My dog has eaten plenty of edemame pods in his day (and he's only 1 yr old!). No worries, it will pass :)