Targs are boar-like Klingon animals with spines on the back. Toby the Targ is a lead character in a series of educational holoprograms for children in the Star Trek universe. In the Deep Space Nine episode "Fascination", Molly plays with a cute stuffed targ she calls "Piggy", which is likely a toy version of Toby. My 13-year-old daughter really wanted a targ like Molly's for Christmas, but the targs available on the market were ugly and looked little like Molly's. So she and I set out to recreate something close to Molly's targ. Molly's targ on the show was actually donated to the show by a fan (see this thread), and was based on a commercial stuffed warthog with added spines. Looking at shots of Molly with her "Piggy", we found the right warthog on ebay, and added spines. It turned out not to be quite as easy as we hoped. The materials for the targ were a Christmas gift for my daughter and we made it together during the week afterwards.

What you need:

Stuffed warthog (more information later)

Fabric for spines (more information later)

Thread

Sewing needle or (preferably) sewing machine

Curved sewing needle (can buy or make)

Polyfill stuffing

Printer

Paper

Marker / pen / gel pen / chalk for putting pattern on fabric

Scissors

The process is reversible: you can cut the seams in the spines and return to the original warthog.

Division of labor: I made a number of revisions of the patterns, sewed a bunch of test spines and cut out most of the spines; flipping the spines was a joint labor by my daughter, son and me; stuffing and final-product sewing was done by my daughter.

The bat'leth in the photo was a Christmas gift I made last year. Instructable here.