And now back to the new Dokidoki Mountain Thomas Set. I was looking at the pictures on the stickers, trying to answer my own question:
Mister No wrote
(is that a dinosaur in front of the volcano in one of the stickers?)
So I was magnifying the pictures, and I found the pictures of Percy, James, Hiro, Gordon, Harold and (bear in mind it's a "Thomas & Friends" Set!) ...
... a treasure chest! Is that a treasure chest?

Yup, it's a treasure chest; what else could that be? Never mind.
Then, there is Bambi.
Is that Bambi?
I bet that's Bambi:

I'm still not sure about the volcano, but that's definitely a dinosaur!

What is that Tyrannosaurus Rex doing in a "Thomas & Friends" Set?
"Oh, look, kids love treasure chests, Bambi and dinosaurs, so we may well just put them on those stickers!"
My only question is: Why? It's a Thomas & Friends set, for crying out loud! Why the dinosaurs and treasure chests?
"Kids would like them."
No further questions. :s