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It was originally intended to make the fossil the player didn't choose available after completing the Tandor Championship.
Snopach and Dermafrost are the only fossil Pokémon capable of learning Ancient Power in Pokémon Uranium, despite all official fossil Pokémon possessing the move after its introduction in Gen 2.
Snopach is a combination of snow and pachydermata (from two Greek words παχύς pachys, "thick" and δερμα derma, "skin", meaning 'thick skin'), an obsolete taxonomic order of mammals that was used by scientists in the 19th century, which included elephants, rhinoceroses, and hippopotamuses as chief members. It is also a pun on snowpack or snow patch. Depending on the pronunciation of the name and word, it may have also been influenced by the word "Epoch" a word used to describe time periods of varying lengths determined by major events. In this case, most likely the Pleistocene Epoch, which is commonly referred to simply as "The" Ice Age. Wherein the mastodons and wooly mammoths that most likely inspired these creature designs last roamed the Earth before going extinct.