Gold Mini Goomba
From the Super Mario Wiki, the Mario encyclopedia
A Gold Mini Goomba is a Mini Goomba under the effects of a Gold Ring in New Super Mario Bros. 2. Similar to other Gold Goomba variants in the game, defeating it grants the player some coins. They mainly appear in the Gold Mushroom Pack's second course. However, they can also be rarely be seen in the main story, in World 4-1 and 5-3.