Customers would ask for the “special” sprinkles.

A “good humor” man will spend the next 3½ years in prison after pleading guilty yesterday to selling massive quantities of prescription oxycodone out of his Staten Island ice-cream truck.

Louis Scala Jr. sold soft-serve and hard drugs — $20-a-pop “oxy’s” — out of his green-and-white Lickety Split truck, Special Narcotics Prosecutor Bridget Brennan had said in announcing the case back in March.

Scala, 29, the son of an NYPD officer, copped the plea in Manhattan Supreme Court to conspiracy and drug possession.