From the Super Mario Wiki, the Mario encyclopedia

The title of this article is official, but it comes from a non-English source. If an official name from an English source is found that is not from the English Super Mario Bros. Encyclopedia, the article should be moved to its appropriate title.

First appearance Super Mario Land 2: 6 Golden Coins (1992)

A Poro is an enemy in the Space Zone of Super Mario Land 2: 6 Golden Coins. It resembles a small spaceship and attempts to crash into Mario while in midair. They orbit large and small blocks. If they are seen orbiting empty space, they are usually orbiting an invisible block. To defeat this enemy, Mario must simply jump on top of the Poro or hit it with a Fireball.

Names in other languages[edit]

Language Name Meaning
Japanese ポロ[1]
Onomatopoeia for something dropping or rolling;
possibly named after the Apollo program.
German Poro -