The question was raised a bit ago, what a "frog" is in reference to flowers and flower arranging. And, although the short answer would simply be that it's something used to make sure that flowers stay where you put them in a vase, I thought a photographic essay might be more interesting.
So here you go...
Some frogs are double-layer discs with holes in them. Ours is a very retro one that my mom got for Christopher. It has a ceramic base, and a bunch of spikes that come out of it which you mount the flowers in.
Oh... Sorry... I promised photos, didn't I?
The frog, itself
which gets put into a flat bowl/vase
and once it's centered and the flowers are ready
you put the firm-stemmed flowers from your garden into it
and adjust them a bit,
and they turn out like this. (Especially if they are put into a Loso bowl.)