All buildings have connecting rooms. Certain buildings are handicap accessible and therefore have king beds with HA amentities; there are in fact a small number of rooms that are standard rooms with king sized bed.
Those buildings are:
Standard Kings - 2,4,6,8 and 9. There are 2 rooms on each of the first 3 floors that feature king beds. These are standard rooms with a king bed.
HA Kings- 0,1,3,5,7. The are 6 HA rooms on each of the 4 floors.
All of the kings mentioned above have connecting doors to a standard dbl room.
So to answer your question. Yes, there are dbl/dbl connections and dbl/king connections. Be aware that those king rooms can be HA though. You can request a dbl/king connection and just make sure your reservation states the desire request.
We requested this for our trip in Jan, but due to high occupency, we were unable to receive it. We were able to get a dbl/dbl connection though. It's difficult to get at times, especially during high occupency times (which seems constant at Pop) but there is no harm in trying! Try checking in early and be able to "give up" other desired requests.