A marsupial's pouch is the marsupium.
Marsupium
The Kock pouch
The pouch is also called the "brood pouch".
Marsupium is the pouch of a female marsupial.
Mammals which have a pouch feature where they carry and nourish their young are known as marsupials.
If the question is referring to the pouch of a marsupial, its proper name is marsupium.
Quiver
Cocoon
If it has a pouch, it must be a marsupial.
The scientific name for pouch snail is Campeloma decisum.
Any marsupial's pouch (including that of the sugar glider) is called a marsupium.
The pouch covering the testes is called the scrotum.