Mosslax is the Pokémon in Pokémon Pokopia covered by moss and plants after sleeping for a very long time.
Mosslax is a specially named Snorlax character. Its name combines the character’s overgrown appearance with the familiar name of the sleepy Pokémon species, making it distinct from an ordinary Snorlax encountered elsewhere in the franchise.
The character illustrates how Pokopia gives individual Pokémon unusual histories and visual identities. Instead of treating every Pokémon as interchangeable, the game presents memorable residents such as Peakychu, Smearguru, Chef Dente, DJ Rotom, and Tinkmaster.
Mosslax is easy to mix up with Snorlax because Snorlax is the species identity behind the character. However, the question asks for the named individual in Pokopia, so “Snorlax” is too general. The moss-covered sleeper is specifically called Mosslax.