Are you talking about actual pork meat, or just pork stock, or both?
Or do you want something akin to Kosher fish dumplings? (And you can rest assured, there are no camel or hyrax dumplings in the SGV, although a rare hare dumpling offering is seen every once in a while.)
But I digress. Fish dumplings do not have pork. Fish dumplings (not XLB) are made with some sort of white fish (although some use salmon), dried shrimp, and some sort of vegetable (either Chinese napa cabbage, chives, etc), and seasonings like sesame oil, white pepper, rice wine, etc. No pork meat, or pork stock.
Now, if you want some type of combo dumpling (like fish, shrimp and sea cucumber, or fish, chicken and pork), then all bets are off.