Peel the mangoes and cut them into pieces. Place the mango pieces in a mediumsized saucepan with water to cover and cook them over low heat for 10 minutes, or until very tender. When cooked, put the mango through a food mill until you have a thick pulp. Place the pulp in a small bowl, cover it with plastic wrap, and chill it for I hour. Meanwhile, whip the cream with an electric mixer or wire whisk, slowly sprinkling in the sugar. When the mango pulp is chilled, slowly fold in the sweetened cream, stirring only enough to make sure that the ingredients are well mixed. Pour the mango cream into individual sherbet glasses, sprinkle each serving with some of the toasted coconut, garnish with mint, and serve.