Food sample is a dummy of foods which is often arranged in front of a restaurant. Food sample has a characteristic that we feel very real than seeing a photo when selecting a food from menu. And using a food sample makes an appeal us strongly. The origin of the food sample is not clear. There is a theory the origin is Osaka.
Food sample was made from a wax in the past. It's made from a plastic, a gum or chloroethene recently. There are some major companies making it. I have seen the introduction article in the job-placement journal.