We don't have synonyms for mascaron yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are mascara, cascaron and macaron.
(n) :
(architecture) A carved, ornamental face, either human-like or grotesque, whose alleged function was originally to frighten away evil spirits so that they would not enter the building.
(n) :
(architecture) A carved, ornamental face, either human-like or grotesque, whose alleged function was originally to frighten away evil spirits so that they would not enter the building.