Use a 110 V fridge in RV ??

rv parks may not want it outside however.

Yes, you can. There are some minor drawbacks.....
Most small reefers sue the sides as the condenser (cooler - where heat goes out), so that has to be in clear space.
If you are going to travel more than a few hours, you will need a 500+ watt inverter to start the compressor.
The electric power demand is too high to effectively boondock or dry camp.

When the original reefer in our coach decided to stop working, I looked at my alternatives. Replacing it in kind was simply not possible as we had recently had decades of personal investment for retirement "redistributed".
The cheep reefer and inverter got us back on the road at a fraction of the cost of replacement.

Matt

We have both a residential fridge inside the camper and also a small one outside for "extras." No trouble so far.

Some RV's are offering a residential fridge as an upgrade.

Yes, Newer RV's with outdoor kitchens use them in the outdoor kitchen.

Our came with the fiver in the outdoor kitchen area. At first I thought it was stupid and take forever to cool down but I was wrong and it works great.

Yes, we have one to add to our fridge space. It is mostly used for beer, soda, and bottled water. And on occasion over flow of grocery items.