Fake scallops and crab are more properly called “surimi” and are made from pollock, cod or other white fish through a fairly involved process. I can’t find any site that speaks to your question, but I believe that any reputable restaurant would not risk their reputation by claiming something to be what it isn’t.
Many years ago, punched out cod was sold frozen as “scallops”, but there have been changes in advertising laws and truth in labeling requirements are more stringent today.