Hors d'oeuvre (or derv)

Hors d'oeuvre (UK /ɔrˈdɜrv/ or /ɔrˈdɜrvr(ə)/,^[1] US /ɔrˈdɜrv/; French: [ɔʁ dœvʁ] ( listen), literally "apart from the main work") or the first course, are food items served before the main courses of a meal.^[2]

The French (singular and plural) is hors d’œuvre; in English, the œ ligature is usually replaced by the digraph "oe" with the plural often written as "hors d'oeuvres" and pronounced /ɔrˈdɜrvz/. There are several related terms, such as a one-bite appetizer, as an amuse-bouche.

In short pika-pika or finger food.