Yes, many fonts use double story 'a' for roman and single story 'ɑ' for italic. Calibri, Segoe UI, Times New Roman, Droid Serif, Merriweather, Consolas, and Source Sans Pro are examples I found from quick searching.
And while I agree "oblique" is a more technical term, "slanted" is frequently used to mean the same thing, and is probably more understandable. Perhaps I am wrong and it isn't :)