Ms Google says:
661,000 English pages for "iced coffee"
124,000 English pages for "ice coffee".
I think it natural to assume that the difficulty of pronunciation alone will speed the transition from 'iced' to 'ice' for both coffee and tea. The latter is hardly 'wrong', but I will keep using 'iced' when I am writing.
As for 'coffee mix'-- well, I see nothing semantically wrong with that. There is no 'right' or 'wrong' in this instance, either.