Flies spawned by The Husk will not become passive.
In-game Footage
Trivia
Skatole is a mildly toxic white crystalline organic compound that occurs naturally in feces.
According to Edmund McMillen's First post-Repentance Lore Stream, Skatole's visual was designed first, with McMillen then working backwards to create an appropriate effect to justify an item that puts a poop on Isaac's head.
Skatole was considered as a cosmetic hat for Team Fortress 2, alongside tears, Brimstone, and Tiny Planet. It was dropped as Valve "... didn't want players running around with a wet piece of poop on their heads."