Yes Fingerling Potatoes are the same as Ratte Potatoes.
If you cannot find Ratte Potatoes in your store then they may be called Fingerling Potatoes.
The potatoes Fingerling Potatoes and Ratte Potatoes are the same exact potatoes which are just under different names.
If you cannot find Ratte Potatoes in your grocery store then you can buy Ratte Potatoes through Amazon Grocery.
I buy Ratte Potatoes through my Amazon Grocery and Amazon account and they are delivered to my door within a day or two at most.
You can buy groceries through Amazon Grocery from your home without having to go grocery shopping.
It's cheaper to shop for some groceries online through Amazon Grocery than it is to go to your regular grocery store.
Although I still shop for some groceries at my local grocery store but Amazon Grocery is a great place to buy Groceries including Ratte Potatoes.
Ratte Potatoes are also called Fingerling Potatoes.
So if you cannot find Ratte potatoes in your store look for Fingerling Potatoes and you may find them.