Can you use feta cheese instead of fontina cheese?

While both feta and fontina are types of cheese, they have different textures, flavours, and melting properties, so they are not suitable substitutes for each other. Feta is a crumbly, salty cheese that is traditionally made from sheep's milk, while fontina is a semi-soft, creamy cheese that is made from cow's milk. Feta cheese does not melt well, so it would be a poor substitute for fontina in dishes that require melted cheese.