The Puff Stitch is a specific form of the Cluster Stitch - and can be referred to by both names. It's a simple stitch to make, though it can take a bit of practice to keep all the tension even. It creates a ton of texture and is similar in effect to the bobble. Here's how it's done!
Puff Stitch Video Tutorial
Puff Stitch Photo Tutorial
The Puff Stitch shown here is essentially a hdc4tog all in the same stitch. In other words, you're going to start 4 hdc stitches in the same stitch, but not finish any of them until the end. There are two ways to finish it off - the "standard way" and the "moogly way." It's easier to see in the pictures below. However, note that not all puff stitch are made with the same number of loops! Always check the pattern for instructions on the specific version of the puff stitch used.
This tutorial features Lion Brand LB Collection Cotton Bamboo and a US - H, 5mm hook.
Step 1: Yarn over and insert your hook into the next st. Yarn over and pull up a loop, pulling all the loops to the height of an hdc stitch. 3 loops are now on the hook.
Step 2: Yarn over and insert your hook into the same stitch, yarn over and pull up another loop, pulling the height of these loops up to meet the others. 5 loops now on the hook.
Step 3 & 4: Repeat Step 2 twice more, so that at the end of step 4 you have 9 loops on the hook.
Finishing the Puff Stitch the Standard Way: With all 9 loops pulled up tall on your hook, yarn over and pull through all 9 loops. Work a ch st to close up the stitch. Note that this swatch started with 5 sts, but it would seem you have 6 sts after this - so be aware that you'll have to avoid working into one of these loops or skip the next stitch to keep your stitch count even.
Finishing the Puff Stitch the Moogly Way: With all 9 loops pulled up tall on your hook, yarn over and pull through just the first 8 loops. 2 loops now on the hook. Yarn over and pull through the last two loops. Note that this swatch also started with 5 sts, and the final swatch also has 5 sts - this method makes it easier to keep your stitch count correct.
I prefer to finish the Puff Stitch my way, because the last yo and pull through sits on top of the loop you pulled through the first 8 loops, whereas with the standard version you've got the first pull through followed by a chain right next to it. This might seem trivial, but when working the next row with the standard version you have to be careful not to put an extra stitch in there. However, I strongly encourage you to experiment with both methods to see which one you prefer - and which one you prefer in any particular project!
And if you enjoyed this tutorial, please vote for Moogly in the Craftsy Blogger Awards for Best Tutorials in Knitting and Crochet!