Drumsticks do not use real ice cream.
Drumsticks ice cream actually is made using a frozen dairy dessert which they are also labeled as.
The frozen dairy dessert is a type of ice cream, but it's not considered ice cream due to the ingredients and less milkfat.
The frozen dairy dessert that the drumsticks ice cream cones are made from are made using vegetable oils and stabilizers instead of the high milkfat content that is required for actual ice cream to be called ice cream by the FDA.
This gives the drumsticks ice cream that is in the ice cream cones their unique, slow melting texture.
Although the drumsticks ice creams contain dairy, the formula with added emulsifiers like soy lecithin and gums, keeps them from melting into a puddle like regular ice cream does, which helps the drumsticks ice creams maintain their shape longer.
For ice cream to be considered ice cream, it must contain at least 10% of milkfat or milk solids.
Instead the drumsticks ice creams use vegetable oils like palm oil or coconut oil and stabilizers like carob bean gum, guar gum and soy lecithin, which creates a creamy texture and prevents rapid melting.
The added emulsifiers and stabilizers in the drumsticks ice creams bind the ingredients together and reduce ice crystal formation and slow down the melting process and allow the frozen dairy dessert in the drumstick ice cream cones to hold it's structure.
If the ice cream in the drumsticks ice cream cones were true and regular ice cream it would melt when it was in the heat or at room temperature and would not hold it's shape.