(from 3:18 onwards)
Cherry Attack (Mirae, Linlin, Chaerin) - Team by Iggy Azalea (girl crush concept)
(from 3:37 onwards)
Cherry Chu (Haeyoon, Remi, Kokoro, Bora) who also recorded their singing - Me Too by Meghan Trainor (cute concept)
(from 2:40 onwards)
These were for their mission in their reality show recently where they got dance tips from two choreographers and split up in their little teams to do different dance concepts.
sources: FNCEnt 1, 2, 3 (updated with official YouTube links)