Hey, Mariel,

Well, yes, you can use the seat unit part and other accessories on the Frog - but ONLY from the Bugaboo Cameleon 1 and Bugaboo Cameleon 2 (Plus) (so the older models). The newer parts will NOT fit the old Bugaboo Frog. You will need to get the older spare parts and accessories either from an old stock somewhere or from used prams in classifieds.

P.S. Be aware that you cannot use the Cameleon bassinet fabrics on the Frog frame, you need also the Cameleon frame with the textiles to fit it the Frog stroller chassis.