Never heard of it as a strain.
But this is what 420dictionary.com has to say about the term:
"frosted flakes: n. - Marijuana laced with other dope. <Salgo6T9 July 4, 2004>"

As for the smell, have you ever hear of shady dealers spraying their buds with fruity soda or gatorade to make them look and smell better?

I think you may have just gotten ripped off, sorry.