In a large bowl, mix strawberry gelatin with boiling water, whisking until completely dissolved. Add the crushed ice, stirring until it melts.

Whisk in the instant vanilla pudding until well blended and the mixture thickens.

Cover the bowl with plastic wrap and chill in the refrigerator for 15 minutes.

Fold in the thawed whipped topping until fully incorporated into the gelatin-pudding mixture.

Gently stir in the quartered strawberries, drained pineapple, and mini marshmallows.

Refrigerate for at least an hour before serving.