Duke Gadd's mother is not happy with Corey Feldman... 'cause the coroner hasn't ruled on her son's death yet -- so, she doesn't know how "Dr. Corey" can tell everyone he knows how Duke died.

Child actors Corey Feldman and Corey Haim remain linked years ... with whom he shares son Zen. "These sick, twisted and outlandish allegations never occurred. Period," Sheen's publicist told ...