I want to make 150 Sunflowers to go on top of chocolate cupcakes for a wedding shower. Can the sunflowers be made ahead of time and frozen or what? I don't want them to be hard on the cupcakes when I serve them. The only ingredients in the icing for the sunflowers are crisco, powder sugar, milk and vanilla flavoring. HELP!!!

Yes, they can be frozen. The sunflowers won't be as big to need much defrosting time. This is one possibility.
Another one is to store them cool, but not frozen. Let them air dry. Without looking at the recipe I can only assume - and you know what it makes of me... But the icing will have probably so much powdered sugar and crisco in it that it won't need refrigeration or freezing for quite a long time. The only "risky" ingredient is the milk and unless this is the main part of the icing, the icing itself is safe.