Of course I'm not a doctor but it might also be a tonsil stone. Google it. They are what you describe and are foul smelling and develop in crypts in the tonsils. :)
From the description, this sounds like a superficial throat infection, most likely with the fungus called Candida Albicans, the oral infection typically called Thrush. This is seen, as you describe yours: creamy which patches, anywhere on the tongue, mouth or throat. These can easily be removed by scraping and the diagnosis made when the material is examined with a microscope. The treatment typically involves the application of medication directly to the mouth, tongue and throat, but sometimes oral medication is required.
This condition can occur in healthy individuals, usually on antibiotics, or in individuals whose immune system is compromised.