The Secret Toad-headed Agama, also called Secret Toadhead Agama, is native to the desert and steppe of Central Asia.
It is one of several species of Toadhead Agama.
These photos immediately above and all below were taken in Kazakhstan by Alexandra Makhnina (who got better photos of them than I did).
The fingers and toes are fringed to help running on sand.
Neither Sasha nor I managed to photograph the "secret" -- when it fully opens its enormous pink mouth with frilled side wings.