As PPs have noted, yes - you can request bacon and they will bring it.
The pineapple ham seems polarizing - but I have to admit it's not half bad (it's not half good either - but when the eggs and bacon at Disney breakfasts are in a constant battle to see which can be worse, I'll gladly accept a glass half full). I always think I'm going to request bacon at 'Ohana and end up being satisfied with the standard stuff (really it's the pineapple I like). I also like what the Imagineers came up with for the texture of the ham - it's not to be encountered in the normal world.