Place this apple on any uneaten apple. That apple cannot be looked at by any means until eaten.
Q. Does the Frozen prevent apples such as Wise or Honest from selecting apples that are Frozen?
A. No, apples that are Frozen only prevent all forms of viewing the apple, but doesn't prevent it from being selected by cards. A Frozen apple can still be added to a Pie or selected by Wise, but it will remain hidden during those actions.