A marsupial's pouch is the marsupium.
The Kock pouch
Andy,Alica
The pouch is also called the "brood pouch".
Marsupium is the pouch of a female marsupial.
to carry baby animals
Carnivores
Popples resemble bears with a pouch like a kangaroo. They are furry and brightly colored stuffed animals of sorts. There is a pouch of sorts on their backs that looks like an oddly placed marsupial pouch, which they can go into to resemble a fluffy ball.
digestive system
track
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.