Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
in-crasso, āvi, ātum, 1, v. a., to make thick or stout (post-class.; used mostly in the part.), Tert. adv. Psych. 6.
Hence, in-crassātus, a, um, P. a., made stout, fattened, Tert. adv. Marc. 3, 6; id. Jejun. 6.