RootCellar is the premier refrigerated pantry designed for homes and homeowner lifestyles. An efficiently sized walk-in refrigerator that integrates with your kitchen design and decor. When it's time to build or renovate, no other appliance or amenity offers more function or convenience.
This is not a walk-in fridge, but I found a cool video of a roving fridge that “walks” to you instead of you going to it.
You can also build one if you are a DIY enthusiast.
Here’s another company that sells them!
https://www.rootcellarconcepts.com/
I found this company that sells walk-in cold (or freezer) pantries.