Popcorn stitch is a bobble type stitch which creates a round textured stitch. It is smaller than your regular bobble and is worked over two rows/rounds. You can use popcorn stitch as a texture throughout your project or place them strategically to create shapes such as letters and images.
To make this stitch knit up to a spot where you will be placing a popcorn. Knit and purl into the same stitch a few times, finish the row/round. When you get to this increased stitches on the next row/round, insert your needle into all of the stitches and knit/purl them together.