Until just recently, my children knew of only two types of animal protein: “chicken” and “meat”. The chicken category included not only chicken, but also fish, pork and turkey. And the meat category included beef, venison, and sometimes ham. They were told to “eat your chicken” or “eat your meat”, no matter what it was. This was mainly to avoid the whole “eeewww, I don’t like fish/pork/turkey” reply for as long as possible.
Apparently, Jessica Simpson’s mother never got past this point with Jessica, but we have now started to call things by their real name, and the kids have become curious as to where all their food comes from, so we have to tell them that, too. And since they have eaten these things before and like them, they can’t really argue about eating it just because it has a strange name.