Is the "Dutch Baby" in the pancake group some alternative name for "flensjes" that I'm not familiar with? It's a thin dessert variation of Dutch pancakes that has relatively high egg and milk ratios compared to flour.
No (1). I believe that it's "Dutch" in the same sense as "Pennsylvania Dutch" (2) - i.e. an American version of "Deutsch", actually German.
Dutch Baby or German Pancake is probably right in that abyss.
Very eggy, with some flour/milk. It's essentially a souffle, puffs up to like 6" high in the oven. Tasty with maple syrup, powdered sugar/lemon, or just butter.
6 Eggs, 1 C flour, 1C milk.
https://www.allrecipes.com/recipe/36900/german-pancakes-ii/