I heard today on KGS that a 'Frog' is supposed to be a big group which makes no points and eventually dies. I don't know if the person is correct about it though. I tried to research but didn't get anywhere.
They are completely wrong, Frog is a user from Australia.
Maybe you mean Dango (Dumpling)?
Kuolema: I remember this ^.^ The guy was kibitzing few games, dont remember his name thought.