Peel and chop the mangoes.
Transfer them to a blender.
Blend until completely smooth—you should get about 1½ cups mango puree.
Transfer the puree to a pan. Add 4 tablespoons sugar. Cook on medium heat, stirring continuously, until it thickens slightly.
Let it cool completely before using.
Take chilled whipping cream in a large bowl.
Whisk using a hand mixer or whisk until stiff peaks form.
To the whipped cream, add Chilled condensed milk and Cooled mango puree
Gently fold everything together.
Transfer the mixture into an airtight container.
Cover and freeze for at least 8 hours or overnight.