Muffins or cupcakes?

Finally, after a long time of wondering, this site has expleained to me the difference between a muffin and a cupcake.
It says: " Muffins are usually bigger and not as sweet as cupcakes and they are also made and served without frosting . "

I used the recipe for "Basic Muffin Dough" on cooksunited.co.uk and mixed cranberries and chocolate into it. I filled half of the cups with it, then added lots of cocoa into the second half and filled another half of the cups.

However, I am not sure what I would call mine, since there is not frosting on top, but the size of the cups is really tiny. Options are frosting-free cupcakes or mini muffins. Whatever they are, I hope my friends will like them this weekend.