Trample
When Gluttonous Troll enters the battlefield, create a number of Food tokens equal to the number of opponents you have. (Food tokens are artifacts with "{2}, {T}, Sacrifice this artifact: You gain 3 life.")
{1}{G}, Sacrifice another nonland permanent: Gluttonous Troll gets +2/+2 until end of turn.
Food is an artifact type. Even though it appears on some creatures (such as Gingerbrute), it's never a creature type.
In a multiplayer game, opponents who have left the game aren't counted by Gluttonous Troll's triggered ability.
Whatever you do, don't eat the delicious cards.
You can sacrifice a Food token created by Gluttonous Troll's triggered ability to pay for the cost of its activated ability.
You can't sacrifice a Food token to pay multiple costs. For example, you can't sacrifice a Food token to activate its own ability and also to activate the ability of Tempting Witch.