PlantingOaks said:Pretty sure that is just a rose flower - probably one that got stunted by something - disease and herbicide injury are my first guesses, though cold, bugs or just random luck could be it too.
To be sure, google rose rosette disease and see if any of the images look similar.
If you have other roses and it is rosette disease you will want to get rid of it quickly to prevent spread. It's pretty bad news.
Your rose was probably not grafted with a carnation. Those are different species, and not really compatible. It would be quite a scientific breakthrough! Roses are often grafted with more vigorous rose species roots which may not have attractive blooms, but are still roses.
What makes you think it is a carnation?