Mosslax is based on the Pokémon species Snorlax.
In Pokémon Pokopia, Mosslax is a distinctive Snorlax character whose body has become covered with moss and plant growth after a long period of sleep. The design turns Snorlax's familiar resting behavior into a visual sign of the world's slow natural recovery.
The name combines the ideas of moss and Snorlax, making the character's identity easier to recognize while marking it as a special Pokopia design. Mosslax is not presented as a wholly new species unrelated to Snorlax; it is a unique character or variant associated with the game's setting.
Munchlax is an easy mistake because it is Snorlax's pre-evolution. However, Mosslax's base species is the fully evolved Snorlax, not Munchlax or another sleepy Pokémon such as Komala.