The simple octopus (As pictured above) is crocheted in one piece. You add safety eyes, stuff the head and crochet a disc and sew that on the bottom of the octopus to seal in the stuffing. This is a very quick piece and is perfect for easy toys to sell at craft fairs or a simple gift for a kid. Felt on the eyes to make it toddler-friendly.
The complex octopus (as pictured above) is crocheted in two solid pieces, which are then crocheted together around the entire edge using single crochets. The body of the octopus can be as firmly stuffed as you want. This takes longer than the simple octopus, but achieves a nice realistic look with the suckers/bobble stitches!