"Frou frou" is a French onomatopoeic term used to describe ornate, frilly clothing or accessories. Synonyms for this term could include "frivolous," "ornate," "fluffy," "excessive," "frilly," "ostentatious," "decorative," "extravagant," "flashy," or "fancy." Other words that could be used to describe "frou frou" might include "pompous," "grandiose," "showy," "gaudy," "over-the-top," "dramatic," or "ornamented." Each of these synonyms could be used to describe clothing, accessories, or decor that is excessively adorned or decorative, often with a sense of ostentation or showiness.