A soft heated mass of crushed leaves is commonly called a poultice.

Explanation:

• A poultice is a soft, moist mass-often made from crushed or mashed plant material like leaves, herbs, or other substances.
• It is typically heated and applied to the skin to relieve soreness, inflammation, or pain.
• Poultices have been used traditionally in herbal medicine and first aid.

If you’re referring to a specific type of crushed leaves used in a different context, please let me know!