Just being pedantic, curveball is closer to swing. Perhaps the closet too googly would be a splitter. That said, from the perspective of the language/idiom, curveball would be appropriate usage in the context ...
Its now frequently a third pitch (in addition to the "normal" fastballs mixed usually with a change-up or curve ball and sometimes a slider). Generally a higher risk/reward pitch than any of the aforementioned due to challenges in controlling its motion.