Do you mean gyoza? If you do they have multiple brands in the frozen section. Like more than 10 brands. It's a big selection. In not you can try H-mart or 99 Ranch. They are both within a mile or so.
I’m pretty sure they do. I thought I saw it there once. You’ll just have to ask them.
They do in frozen section. If you want it ready to eat there are some food stand inside H- mart. H-Mart cater mostly to Koreans.
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