My very first place, gf at the time used a butter knife to chip out ice from the freezer. Yeah, had to buy a new one.
Knowing this, and that a coworker wanted to do the same with the mini fridge I of course warn them about how easy it is to puncture the refrigeration line. And yeah another dead fridge.
I’d say most are frost free. Freezer in mini fridges being a big exception.