no you can't, but it's pretty close. i just got the thing and wanted to use it ASAP (new toy, must play, must play). didn't feel like going to the store to get the right grind of coffee. i'll do that this weekend.
it's expresso and ice cream, and just a little milk if needed to make it blend smoothly. we always called them cappuccino milkshakes because ice cream is milk (obviously) and they're mixed together.
espresso beans are coffee beans roasted dark, and generally ground a bit finer. you're supposed to use espresso roast beans, but you don't have to. it's espresso cuz of the way you make it - the steam/pressure brew method.
and hefeweizen is a type of ale, which is a type of beer!