Feasting Troll King
Creature — Troll Noble
Vigilance, trample
When this creature enters, if you cast it from your hand, create three Food tokens. (They're artifacts with ", 
, Sacrifice this token: You gain 3 life.")
Sacrifice three Foods: Return this card from your graveyard to the battlefield. Activate only during your turn.
Illustrated by
Throne of Eldraine#368RareEnglishLegality
Rulings
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.
If you put Feasting Troll King onto the battlefield from your hand without casting it, its enters-the-battlefield ability won't trigger.
Whatever you do, don't eat the delicious cards.
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.
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).
Food is an artifact type. Even though it appears on some creatures, it's never a creature type.