Alien Tigger

In the 2000 Winnie-the-Pooh film The Tigger Movie, during the musical number "'Round my Family Tree", Tigger briefly imagines himself as an astronaut meeting an alien that looks like him. The "alien Tigger" is green and has large black eyes. He pilots a striped flying saucer.

This is not to be considered a real alien species, as it's only seen in Tigger's imagination.

However, coincidence or not, in 2002, a very similar alien is seen as one of the scientists in the Galactic Federation in another Disney movie, Lilo & Stitch. This "alien Tigger" is blue, rather than green, though.