When "Frog and Toad" books hit shelves over 50 years ago, critics couldn't have guessed they would become pop culture icons. Here's how it happened.

A quick glance at sites like Amazon, Best Buy, and Gamestop shows that the Toad figure is already hard to come by online and low in stock at brick-and-mortar locations; it hasn't risen to $100 ...

"Icons are things that are distinctly Queensland, that make us think of ourselves as Queenslanders," she said. "Certainly story of the cane toad over the past 70 years is part of that history.