There is a lot confusion online and in print regarding a Puff stitch vs Bobble stitch, and for good reason. They are often defined exactly the same and each designer has the freedom to describe how they use the term within their patterns.
Therefore, with Cali Chic Baby patterns, I distinguish a puff stitch as 2 to 4 stitches (dc, hdc, tr or otherwise) and a bobble as 5 or more stitches. I include a 2 stitch puff (even though 2 dc, for example, aren’t enough to be “puffy”) since the creation is the same as the more common 3 or 4 stitch puff and it still adds interest to the design.
I show the two taught together below for comparison using the double crochet stitch:
To finish, let’s look at a double crochet bobble stitch, or 5-dc bobble, as I defined above. The bobble stitch is a great way to add eye popping “dots” or bumps to your crochet work.