That the Sages were able to create living beings from inanimate matter by use of the Tetragrammaton is recorded in the Talmud and Midrash. Even Joseph's brothers were able to create living cattle from matter, and eat them alive, as Halachically such a creature does not require shechita and can be eaten 'alive'.
Gershon Winkler brings sources showing that the Maharal's Golem is not necessarily a myth