Surely pineapple ice cream is not difficult to replicate? I'd imagine you'd find it in many a good gelato store in France or Italy.
Ingredients for Dole Whip in Disneyland Californian http://disney.wikia.com/wiki/Dole_WhipSugar
Dextrose
Coconut Oil
Stabilizers (Cellulose Gum, Xanthan Gum, Locust Bean Gum, Karaya Gum, Pectin)
Maltodextrin
Citric Acid
Natural & Artificial Flavor (contains Pineapple Juice), Modified Food Starch,
Malic Acid,
Artificial Color (Yellow 5 & 6)
Mono & Diglycerides
Less Than 2% Silicon Dioxide (Anticaking)
Ingredient list for HB Vanilla Icecream sold in Centra Ireland https://shop.centra.ie/Product/1002792000Fresh Whole Milk,
Reconstituted Skimmed Milk,
Sugar,
Glucose-Fructose Syrup,
Coconut Oil,
Glucose Syrup,
Whey Solids (Milk),
Emulsifier (Mono- and Di-Glycerides of Fatty Acids),
Stabilisers (Locust Bean Gum, Guar Gum, Carrageenan),
Skimmed Milk Powder or Concentrate, Flavouring
As you can see there is a huge difference in ingredients, mainly that Irish / European icecream has a high percentage of real milk and only has natural thickening , flavouring etc ingredients.
The American Dole Whip does not contain any real milk and has artificial additives.