I think it's time for some healthy debate. I propose that for tong fed (this distinction is important) horned frogs moss is superior to coco fiber and foam as a substrate.
Four reasons:
It holds water like none other, keeping the tank nice and humid.
It doesn't cling all over the frog, keeping them nice and pretty to show off and is more natural and requires much less work than foam.
Just as easy for the frog to burrow into as coco fiber.
It comes in big bags for cheap at Home Depot.
What do you guys think?