I have heard them do this.
they bark like always... (then like something is caught in there throat) they squeak (like they might be in pain...)

thoughts... it just sounds odd. I am not worried from a medical stand point just wondering if anyone has heard this

My 12 week old does the bark-squeak,bark-crab and bark-cutoff bark my 22 month olds do the bark-squeak and bark-cutoff bark. the 12 week old does the bark-crab when he gets upset(food not ready,not getting him out of the cage when he is ready.) the other sounds i am not sure.

I would say that a bark-squeak is not pain or anything to worry about. Pain seems to be demonstrated when grunting. Here is Sounds: Grunting in the Gliderpedia.