01 - In a medium saucepan, whisk together milk, cream, sugar, cocoa powder, and salt. Heat over medium heat, stirring frequently, until the mixture is hot and the sugar is dissolved. Do not let it boil.
02 - Remove from heat and stir in vanilla extract. Pour the mixture into the Ninja Creami pint container and let cool to room temperature.
03 - Cover the container and freeze for at least 8 hours or overnight until solid.
04 - Process the frozen base in the Ninja Creami using the Ice Cream setting.
05 - After processing, create a well in the center of the ice cream and add marshmallow fluff, caramel sauce, and chocolate fish or pieces.
06 - Reinsert the pint and run the Mix-In setting to swirl in the toppings. Serve immediately for soft-serve texture or freeze 1-2 hours for firmer scoops.