Step 1: Define frozen milk products.
Frozen milk products are items derived from milk and intended for consumption in a frozen state.
Step 2: Evaluate the given options.
- Kulfi (A): A traditional frozen dessert made from milk.
- Ice-cream (B): A product manufactured from milk and kept frozen.
- Ghee (C): Rendered butterfat; it is not stored or consumed frozen.
- Dahi (D): Fermented milk (curd); it is not a frozen product.
Step 3: Determine the correct classification.
Based on the definitions, the products that fit the category of frozen milk products are Kulfi and Ice-cream exclusively.
Final Answer: \[\boxed{\text{Frozen milk products = Kulfi and Ice-cream.}}\]