We don't have synonyms for tangaroa yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are kangaroo, tangara and tangaloa.
(n) :
(Polynesian mythology) The god of the sea in Polynesian mythology, variously either the supreme deity or of status equal to Tane, and sometimes (e.g. in Samoan and Tongan traditions) revered as the creator god.
(n) :
(Maori mythology) The god of the sea, lakes and rivers, and of the creatures, especially fish, that live in them.
(n) :
(Polynesian mythology) The god of the sea in Polynesian mythology, variously either the supreme deity or of status equal to Tane, and sometimes (e.g. in Samoan and Tongan traditions) revered as the creator god.
(n) :
(Maori mythology) The god of the sea, lakes and rivers, and of the creatures, especially fish, that live in them.