Frozen pizza box in side-by-side fridge
Welcome future google-ers.
I searched and searched to find this answer, and didn't, and I didn't have a frozen pizza box in my house to measure. Well, I bought a side-by-side fridge, and a frozen pizza (or three) so I can answer the burning question on everyone's mind.
Yes, a frozen pizza fits in a (or at least my) 36" side-by-side fridge.
And, a DiGiorno pizza box is exactly 12" square.
So now it's on the internet forever, and those that come behind us will have more information than I did.
(I have a Whirlpool GSC25C6EYY.)