Gastriloquism is a term that refers to the act of speaking or making sounds that resemble those of a stomach. It is a somewhat obscure word that not many people are familiar with, and as such, it can be difficult to come up with suitable synonyms. Some possible alternatives include guttural sounds, rumblings, growls, and grumbles. Other related terms include borborygmus, which is the medical name for stomach rumbling; tummy talk, which is a cutesy term for stomach noises; and belching, which refers to the expulsion of gas from the stomach through the mouth. Ultimately, the most effective synonym will likely depend on the specific context and tone of the situation.