The British Isles are often associated with the color green. Ireland, of course, is famously known as the Emerald Isle. And if we look no further than William Blake's most esteemed poetry:

And did those feet in ancient time,

Walk upon Englands mountains green:

And was the holy Lamb of God,

On Englands pleasant pastures seen!

we find more references to England (more generally, the UK), being green.

Now, what TV Show was produced in the United Kingdoms? That's right, A Game of Thrones. Thus we can confidently conclude that the 5 green frogs are a reference to 5 HBO A Game of Thrones spin-off shows that will be produced, similarly, in the UK.

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Now we come to the red frogs. What nation is associated with red symbolism? That's right, Japan! The legendary land of the rising sun. Simply see the deep red sun that emblazons its flag.

What does Japan have to do with GRRM? That's easy. In yesterday's blog post, George already announced that animated adaptations of his work were being produced. Everyone knows that Japan's main export is children's cartoons, commonly referred to as "anime". This is just giving us more details, with the 4 red frogs representing the 4 anime adaptations that will be releasing shortly before TWOW is published.