i just had an idea that can be implemented either in the form of a team or of a game mode
this is not like specialists...

so you have this team of special hogs, the first ones i thought about are:

lady hog, which if you get too close of, she will draw you close to her and you will be stuck there, and if you control her, you can walk by other hogs and start dragging them behind you, very useful when walking on a girder with a hole in it

another hog would be fat hog, which you can't punch or bat and if you shoot at it, it won't move from its spot, only downwards, but if you control him, you can jump on top of other hogs and cause damage, say 2hp per jump repeatedly.

another hog could be stinky hog, if you walk in front of him, you get sick, same if you control him, but let's say that you won't remain sick, maybe just get damage by stench

bathog or birdhog, which flies away if you get too close of him, and you can fly him when your turn...

there can be many such special powers hogs, and i reckon it might be tons of fun