From the Super Mario Wiki
and a Tail Bob-omb
Tail Bob-ombs are Mario's longtime explosive enemies, the Bob-ombs, with Tanooki tails. They are a species which were first appeared in Super Mario 3D Land. Unlike ordinary Bob-ombs, they have the ability to descend slowly from the sky. They are not able to stand upright, and will remain sitting down on the ground in the spot they landed at and will quickly explode. They only appear in World 7-4, Special 7-3 and Special 8-Crown.
The player is able to defeat these enemies by running into them while they are sitting on the ground. Jumping on them will have little effect, and it will merely shift the Bob-omb's position. They can damage Mario (or Luigi) by falling from the sky and landing on him, or being near the bros. when they self-destruct. Tail Bob-ombs behave in a similar way to Para-bombs in previous games.
Names in other languages
||Bob-omb à Queue