[Camillo]

The link only shows pinguis as an adjective or adverb. I don't see any reference to it being a noun on that page.

[jaclaz]

>Subst.: pingue , is, n., fat, grease, Plin. 11, 37, 85, § 212; Verg. G. 3, 124: “taurorum, leonum ac pantherarum pinguia,” Plin. 28, 9, 38, § 144: “comedite pinguia,” Vulg. 2 Esd. 8, 10.—

"Comedite pinguia" may be not "classic" latin, still it is known enough:

https://books.google.it/books?id=VOmwZ1AwFsMC&printsec=front...