Whisk flour, sugar, and salt in a large bowl.
Beat eggs, milk, melted butter, and vanilla in another bowl.
Combine wet and dry mixtures until smooth; rest for 10 minutes.
Heat skillet over medium-low, brush with butter.
Pour ¼ cup batter, swirl to spread thin; cook 1–2 minutes per side.
Peel and dice mangoes; whip cream, sugar, and vanilla until stiff peaks.
Lay pancake pretty side down; fill with whipped cream and mango.
Fold bottom, sides, and top like a burrito; chill 15 minutes.