you could use an afghan hook, but you would have to know how to make the tunesian rib which is more complicated than plain afghan stitch,
if you just want a scarf with the rib stitch that you have seen in stores then just use the FP and BP DC, I just made a hat with that stitch and I really love it (although the stitch takes much longer than plain double crochet).
Also, some people add ribbing by making a strip in single crochet tbl (through the back loop), which looks a lot like ribbing, and sew it on to cuffs, collars, and hems.
I have even seen some people crochet a garment and then pick up stitches to knit ribbing rather than try to substitute with crochet (it seems like most crochet stitches try to mimic knitting, and if you can already knit in the first place, why mimic? if you want truly stretchy ribbing, then knitting is the way to go)