Pale green things.

There was really no use in talking him down--a bullfrog has his pride. And there was no one willing to do it if he would--amphibians are notorious gamblers. Once the notion of a bet is lodged in the clay deposits of their brains, they are intransigent. So between the stubborness of a bullfrog with something to prove and a mass of singleminded high rollers, things were not going to budge. They don't call it a bog for nothing.

And so the bets were placed, and slick fingers passed every type of swampland currency: marshpearls and methane baubles, tiny beetles trapped in amber, and lilypads stamped with the image of All-Father Heron. While a thousand wet voices warbled together, and a thousand webbed feet slapped the stone, and each nicitating eyelid fluttered in an ecstasy of trade, while the bullfrog creaked more with every lungful. Until the whole swamp was...fit...to...burst.