Yes, you can freeze the cookie dough.

I used the icing recipe in the post. I colored it orange and put a small circle tip on and make a dash with the icing. The icing was thick enough to stick up at the end, creating a fun carrot look.

yes I start with 5 and then add flour as needed, often I wind up using 6 six cups, sometimes I have used a little less, on colder days the dough may be colder and on hotter days (like it is where I live) it seems I need some more. If you have any doubts on the consistency, bake 2 cookies and see how they turn out.