If you don't know how to use 'magic ring' for crochet, google it - there are several excellent tutorials on the web.
Using magic ring, make a starting ring of 6 stitches. Join last st to first st with a sl st & tighten the ring so there is no hole showing. Now the idea is to make a flat circle that will be the frog's head/face. So if you need to do more or fewer stitches to keep this circle flat, then do so. What I did was: ch 1 in same space as sl st, 2 sc in each sc around, join. Next round: ch 2, 2 hdc in each sc around, join. Last round: *Ch 2, 4 hdc in same space, ch 3, sl st in same space*, sl st in next 4 hdc, repeat eye between *'s. I glued goggle eyes on the eye bumps using a hot glue gun.
BTW, I used camo green for my frog but a solid green works, too.
With red, and leaving a 3"-4" tail, sc a chain of 50 sts, or whatever length you want the bookmark to be. Turn & work hdc in each ch, starting with the 3rd ch from the hook. Cut yarn, leaving a 3"-4" tail. Thread tails thru your frog face using 2 different stitches, centering the tongue on the bottom half of the face below the eyes and about half way down. I tied the tails in the back before weaving all ends in. I took the red tails back thru another stitch and then back into the tongue to bury them.
If you find this pattern usable, you are welcome to it. I only made a single bookmark, for a 4 yo boy who loves frogs. And unfortunately, I didn't take pictures of it before I sent it to its new owner.