We don't have synonyms for marsupials yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are marsupial, marsupialia and marsupia.
(n) :
Any member of the mammalian infraclass Marsupialia, including those where the female has a pouch in which it rears its young through early infancy, such as kangaroos, koalas, wombats and opossums, as well as the pouchless shrew opossums.
(n) :
Any member of the mammalian infraclass Marsupialia, including those where the female has a pouch in which it rears its young through early infancy, such as kangaroos, koalas, wombats and opossums, as well as the pouchless shrew opossums.