The pattern is worked in the round and stuffing added as you go. the arms and legs are not stuffed but you can insert a wire through the limbs and body, then the arms are sewn into place.
If you use a larger hook and thicker yarn you could make a larger frog.
I use saffron drops cotton yarn with a 2.5mm hook.
You will also need some craft wire and cutters, needle for sewing in the ends, stuffing and safety eyes.