Frog isn't touching the ground?  The frog pad will stimulate frog growth and health.  Just measure from the ground to the frog or from the frog to the wall height to know the thickness of pad needed.  
Want to make a frog support pad? This pad can be placed on top of another pad, taped on or in a hoof boot.  The frog pad has adhesive on one side to be able to attach it to keep it in place when applied in a boot or on a pad.