Ventriloquizing is a unique word that refers to the act of projecting one's voice so that it appears to be coming from another source, typically a puppet or an inanimate object. However, if you're looking for some synonyms for ventriloquizing, you may want to consider terms like mimicking, emulating, imitating, or impersonating. Other similar words that could be used include echoing, parroting, or echoing back. Ultimately, the term you choose will depend on the context of the situation and the specific type of imitation or projection you're talking about. Regardless, there are plenty of options to choose from when it comes to describing this unique and somewhat mysterious art form.