Spelling question - fraiche or fraîches?

James, 

both are correct with ‘ fraiche/s ‘ being the reformed spelling and ‘ fraîche/s ‘ still in common use. 

Many words in French have 2 officially accepted spellings, as spelling reforms of 1990 are in use but there has not been universal adoption of them. 

Words ‘ traditionally ‘ containing a circonflexe letter in them have mostly changed, although some have an obligatory circonflexe still. 

 https://www.dictionnaire-academie.fr/article/A9F1500

 https://www.larousse.fr/dictionnaires/francais/frais/34968

 https://en.wiktionary.org/wiki/Appendix:French_spelling_reforms_of_1990

 https://www.carrefour.fr/p/creme-fraiche-epaisse-entiere-carrefour-classic-3270190021001