Yeah, but it’s not so impressive once you realize they’re all named “Bruce”.
Not as prehensile as a monkey’s tail, no, but enough to pick up objects.
Ron Jeremy has been known to pick up objects [sub]of his desire[/sub] with his, but that doesn’t mean it’s pehensile. Huge, yes, but not presensile.
Technically, no. While dolphins do have terrestrial ancestors, those ancestors were not known as “dolphins” (they were cetartiodactyls). By the time dolphins show up in the cetacean evolutionary tree, the group was already fully aquatic.
Can he move his around unaided?
No, “up” doesn’t count. 