We say "mad as a cut snake" in Australia, and this can have either meaning: crazy or angry. But that's how some Aussie idioms work (double meanings). As to the box of frogs, I'd have to guess at the meaning as well. I think the main idea is not to open the box! ;) We have the froggy Australian expression, "to go off like a frog in a sock", which is used to mean a very successful party - lots of energy!

it should be mad, as in crazy. :)

I once heard a man on the radio in Ireland say that someone was "mad as a fish"! He meant crazy... .

I rarely get angry, dear Marc:)

I actually wondered after reading your entry. Is she angry or crazy?