simple,place frog in a 2litre icecream container,cover with wet grass,wate weed etc etc,even damp paper towels,punch a few air holes in the lid(better do this before you put the frog in??)grass should be enough that the frog as not much space but has to burrow amognst the grass etc.Now put your container in side another slightly bigger cardboard carton etc and pack around the sides with crumpled newspaper to hold the first container in place,leave as much air space as you can,you just want your first container jammed in position if you get what I mean.Now put your address on it ,mark it this way up,fragile and send it,don`t necessarily tell them its a frog as that is not a need to know and could cause rejection by your courier.