Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
ventrĭlŏquus, i, m. [venter-loquor], one who speaks from his belly, a ventriloquist, Tert. adv. Marc. 4, 25; id. adv. Prax. 19; Hier. in Isa. 3, 8, 20.