The tree-guy is... a little like the ones in Lord of the Rings. Except he's closer to human-size, can basically only say three words, and... believe it or not, while he's one of the most powerful beings up here, I don't know if I've ever met anyone with a gentler soul. His name is Groot, and he's kind of adorable.
The raccoon? Yeah. That's Rocket. He's kind of a jerk sometimes, but as brave a being as I've ever met. Brilliant mind, too. If we'd had him for weapons tech and strategy during WW2, I think the war would've been over FAR earlier than it was.
As for your other question... yes, there is a version of Tony here. He's almost exactly like the one we know. If you want to get together, I can catch you up on everything going on here. Believe it or not... what I've already told you isn't even the craziest of it.