Green’s Dictionary of Slang

(US) an avaricious person.

1970		in H.S. Thompson Great Shark Hunt (1980) 184: Dead-end the highway, zone the greedheads of existence.
1982		G.B. Trudeau Dressed for Failure n.p.: You descended into the valley of the greedheads and returned in one piece [HDAS].
1998		J. Kim Diamonds Aren’t Forever 122: He was always full of himself. Just another Wall Street greedhead.
2006		C. Hiaasen Nature Girl 165: The world is crawling with creeps and greedheads.