There may not be a large number of widely popular 'belly stuffing visual novels' in the general gaming market. Since it's a rather specific and somewhat unusual concept, it might not have the mass appeal that more common themes like fantasy adventures or romances have. But within certain sub - cultures or among enthusiasts of unique and off - beat visual novels, there could be some that are relatively well - liked. These might be created by indie developers who are exploring this particular niche.
In the broader scope of the visual novel industry, it's not common to find highly popular 'belly stuffing visual novels' on the same level as, say, popular romance or mystery visual novels. The concept is quite specific and may not appeal to a wide range of audiences. However, in some small, dedicated communities, there might be titles that are considered popular within that context. These might be shared among fans who are interested in the idea of food - related or body - related themes in visual novels. It's also possible that some of these are only known within a very local or specialized group of developers and players.