Frank J. Wilstach, comp. A Dictionary of Similes. 1916.

Greed

Greedy as a hog.
—Anonymous

Greed was like a slip-knot drawn more and more tightly about his heart, till reason at length was stifled.
—Honoré de Balzac

As greedy as ten cocks scraping in a dunghill for ae barley pickle.
—Scottish Proverb

Greedy as a cormorant.
—John Skelton

Greedy as hell’s mouth.
—Leonard Wright