We don't have synonyms for cattails yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are rattail, cattalo and coattails.
(n) :
(US, historically, Yorkshire, Lincolnshire) Any of several perennial herbs, of the genus Typha, that have long flat leaves, and grow in marshy places.
(n) :
(US, historically, Yorkshire, Lincolnshire) Any of several perennial herbs, of the genus Typha, that have long flat leaves, and grow in marshy places.