Clark Ashton Smith made some work in a soft stone at Crater Ridge, that looked pre-ice age in origin (Dog of Commoriom) and even preCambrian (Azathoth), but was actually c.1930. He fired his pieces in a kiln. Your work looks pre-ice age even.
Some work had lost title labels, so many are called simply "goblins".
Clark Ashton Smith made some work in a soft stone at Crater Ridge, that looked pre-ice age in origin