The Kingdom Hearts Kingdom Key ice tray is available to pre-order through the North American and Japanese Square Enix online store.
Pre-orders for a Kingdom Hearts Kingdom Key silicone ice tray are currently open.
Square Enix released Kingdom Hearts ice trays in the past.
Additionally, Kingdom Hearts 1.5 + 2.5 ReMix, Kingdom Hearts HD 2.8 Final Chapter Prologue, and Kingdom Hearts 3 are scheduled to release for the Nintendo Switch.