I am not sure if thats even what it is called.. but I was curious how one would carve circles in a cake like if you did a sponge bob cake or a cheese block.. would you use a small icecream scoop possibly? and should i refridgerate it before doing that??

I am making a green bay packer cake for my friends birthday and was thinking of either doing a cheese slice or the whole circle block.. but wasnt too sure how to do that and cover with fondant..

Aor use a cookie cutter for the circles?

I have done one spongebob cake and just used a regular kitchen spoon to carve out the circles, that way i could get them the size and depth that I wanted, I would imagine that any of the items you mentioned would work as well. I bet a melon baller would also work.

Have fun and enjoy the experience.

also.. a silly question. i have a light yellow pre made fondant-- could i add some more yellow to that to make it a darker shade of yellow or should i just start over??

--- if you cover the cake with fondant after i cut the wholes, just simply press the fondant in the wholes gently to prevent tearing??