Hösn and Dösn
From the Super Mario Wiki
Hösn and Dösn are aliens living on the planet Hösndösn. They only appear in the comic "Super Mario: Verloren in der Zeit" of the Club Nintendo magazine. While Hösn is smaller than his friend and has green skin, Dösn has blue skin and his ears look like wings. Both are a bit plump in appearance. Not much is known about these characters, except that they are involved in the organization of an event called the "intergalactical Olympics". They agree to use Mario's Alarm Clock as a trophy for the Olympics. Like seemingly every citizen of Hösndösn, Hösn and Dösn replace the letter "o" with "ö" when they speak.