Can you say cher amis in french?

"Cher amis" is grammatically incorrect in French. You would need to say:

* "Chers amis" (for male friends)

* "Chères amies" (for female friends)

* "Chers amis et chères amies" (for a mixed group of friends)

The plural form of "cher" is "chers" for masculine and "chères" for feminine.