Yes! Collagen can help in the fight against cellulite by strengthening connective tissues of the skin, and making your skin plumper and therefore less dimpled.
Cellulite comes from many different things, but when your own collagen levels increase, your skin walls will strengthen and retain more moisture resulting in the skin which looks firmer and more hydrated.
When your skin becomes firmer, and smoother, it reduces the appearance of cellulite lumps!
I also recommend scrubs -- my favorite one is to mix apple cider vinegar, coffee beans, coconut oil, turmeric altogether (it might not look or smell so great) but it has SUCH softening and skin-turning properties!