When I started to learn English, my teacher told me dumplings is a translation for Chinese 饺子 (a food, also widely found in Japan or Korea). But after a few years, I was surfing on the internet and get the information that dumplings actually can be used for all kinds dough-wrapped-with-inner-filling food.

So, what do English native speakers think exactly of this word? If I have a shepherd's pie or 包子 or 烧卖, can I call them “dumplings”?

Edit: Some images showing what I'm talking about.Do they considered as dumplings?