Comforters are stuffed with filling of some kind. Some places use 'sheets' of the filler, preventing bunching when washed. Some use loose filler, and, as you can see, it bunches when washed. Since its a polyester fiber, heat will make it stick together. Down and feathers don't melt so they don't stick.
I would not count on it working, but you could try putting back in the dryer with no heat and a couple of tennis balls.
Other than that, no.
Next time, cold water and line dry