They’re from this company, I’m in nyc so not sure where else they’re available… i get the not spicy dumplings since I’m wimpy. The noodles ones are fine, the buckwheat are tasty but i feel silly buying something so simple that i can make myself.
http://ecomealorganic.com/product/vegan-meal-gourmet-dumpling/
Nasoya started making vegan dumplings recently, the skin is a little thicker but they’re tasty and maybe easier to find
http://www.nasoya.com/healthy-tofu-products/dumplings/
And if all else fails the frozen veggie gyoza from trader joe’s are actually vegan and excellent.