C.H.U.D. II - Bud the Chud (1989) http://www.imdb.com/title/tt0097001/
A couple of teenagers break into a secret government science lab and steal a frozen corpse for a high school prank and accidently awaken the corpes which turns out to be a CHUD, ironically named Bud, who goes on a killing spree and making his victims also canabalistic CHUD's and its up to the teens to stop him.
Brian Robbins ... Steve Williams
Bill Calvert ... Kevin
Tricia Leigh Fisher ... Katie
Gerrit Graham ... Bud Oliver / Bud the C.H.U.D.
Robert Vaughn ... Colonel Masters
Larry Cedar ... Graves
Bianca Jagger ... Velma
Larry Linville ... Dr. Jewell