Re dei Troll Gozzovigliante

If an effect refers to a Food, it means any Food artifact, not just a Food artifact token. For example, you can sacrifice Tough Cookie (an Artifact Creature — Food Golem) to activate Maraleaf Rider's ability (an ability with "Sacrifice a Food" in its cost).

You can't sacrifice a Food to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate Maraleaf Rider's ability.

Whatever you do, don't eat the delicious cards.

Food is an artifact type. Even though it appears on some creatures, it's never a creature type.

If you put Feasting Troll King onto the battlefield from your hand without casting it, its enters-the-battlefield ability won't trigger.

If you cast a creature spell that enters the battlefield as a copy of Feasting Troll King, such as Clone, the enters-the-battlefield ability will trigger.