What are their names?

Their names are あまつ様 (in red) and やなぎばころん (in blue).

Official set info / buy (in the description u can find their names again):
https://www.amatsusama-fc.com/ec/products/1260

あまつ様 twitter/instagram profile:
https://twitter.com/R_Ap8_
https://www.instagram.com/r_ap82_/

やなぎばころん twitter/instagram profile:
https://twitter.com/koronsui/media
https://www.instagram.com/koronsuiclinic/

Proof (post on their social with photo of the same set):
https://www.instagram.com/p/BvOXC7ln81p/
https://www.instagram.com/p/B6Ivi7mHm_5/
https://www.instagram.com/p/BsZ-NKWhfze/
https://twitter.com/koronsui/status/1159848093472346112
https://twitter.com/R_Ap8_/status/1164846705939869701
https://twitter.com/R_Ap8_/status/1240988908793384961
https://twitter.com/R_Ap8_/status/1238400297648525312
https://twitter.com/R_Ap8_/status/1206417238498037760

Their names are あまつ様 (in red) and やなぎばころん (in blue).

Official set info / buy (in the description u can find their names again):
https://www.amatsusama-fc.com/ec/products/1260

あまつ様 twitter/instagram profile:
https://twitter.com/R_Ap8_
https://www.instagram.com/r_ap82_/

やなぎばころん twitter/instagram profile:
https://twitter.com/koronsui/media
https://www.instagram.com/koronsuiclinic/

Proof (post on their social with photo of the same set):
https://www.instagram.com/p/BvOXC7ln81p/
https://www.instagram.com/p/B6Ivi7mHm_5/
https://www.instagram.com/p/BsZ-NKWhfze/
https://twitter.com/koronsui/status/1159848093472346112
https://twitter.com/R_Ap8_/status/1164846705939869701
https://twitter.com/R_Ap8_/status/1240988908793384961
https://twitter.com/R_Ap8_/status/1238400297648525312
https://twitter.com/R_Ap8_/status/1206417238498037760