Repeat Impressions has one (scroll about 1/2 way down to see it at the link below) It is in the Funny Bones section. It is item # 7007-J:
Funny Bones Stamps by Repeat Impressions
According to this link it is an Irish toast:
Underpants and Frogs
(I was unable to copy/paste from either link to share the saying).
Okay ... I tried another site (
Frog Blessing) and this is copied/pasted from it:
May the light always find you on a dreary day,
When you need to be home may you find your way,
May you always have courage to take a chance,
and never find frogs in your underpants.
frog saying
