any good frosting
in fact yes sometimes i take the icing off cupcakes tast real good without frosting or icing.
If a frosting recipe has butter in it, use the butter. Oil will change the consistency and not taste good.
no
about a 3 days to a week
check out http://www.helium.com/items/1189518-recipes-cream-cheese-frosting it looks pretty good :)
Chocolate frosting is always a classic and will go great with coffee cakes. My advice is that the simpler your frosting it is, the more extravagant and elegant it will look on your coffee cake.
whipped frosting
What you can do to make it thicker is add marshmellow cream... it makes it semi- taste like Twinkie filling but its actually really good... but whipped cream is also a good frosting by itself..its nice and light for any dessert.. Good Luck!
Out of frosting
You can find recipes for frosting at the following websites...www.tasteofhome.com/homemade-frosting-recipes or at www.tasteofhome.com/homemade-frosting-recipes
The best frostings to stand up in the heat are fondant frosting and royal frosting.