The MAylan Horned Frog (Megophrys nasuta) is a marvel of camouflage. What you don't see in this photo is that it looks exactly like a leaf that has fallen to the forest floor of its native Malaysia. What you do see is the grumpy, unimpressed disposition of a large-headed frog that is described as both "predacious and voracious."
They make for good pets. They'll use both the terrestrial and aquatic portions of its terrarium, dine on all sorts of invertebrates (and rodents, lizards, and other frogs if you're so inclined), and will even breed in captivity. But they'll also make you feel inadequate as they watch you with those disapproving eyes as you move about the house. So it's kind of a toss up.