Hideous! Aka Deformed Freaks (1997) [Blu-ray]

Dr. Lorca, an eccentric collector of biological oddities, has just acquired his greatest specimen; a horrible mutant born of noxious waste... but the creature's rightful owner wants it back. The collector's clash is cut short though, as the sickening specimen comes to life, re-animating an angry, oozing little army of ferocious freaks.