Are there any examples of Hot Ice or Ice-7 on planet Earth?

Naturally occurring? Probably not.

You need existing ice to be exposed to something like 3GPa. By increasing the pressure you’re generating heat. A lot of heat. So a separate system would need to be present to get rid of said heat or to start in a cold enough environment.

So three problems as I see things:

1. No place cold enough to maintain solid ice throughout the pressure increase.
2. No naturally occurring system to cool down ice throughout the pressure increase.
3. Places on/in Earth that have that kind of pressure are too hot to maintain ice.

So, your kind of left with laboratories.