no
Technically no.
No.
They have skin [its octopuses or octopi]
Nope. They are reptiles. Cephalopods are octopuses and squids and cuttlefish. Reptiles and cephalopods are not very closely related at all; cephalopods are protostomes and cephalopods are deuterostomes, and the protostome/deuterostome split occurred very early in the history of animalia.
octopuses can cchange and blend in with all kind of colors
Tree octopuses do not exist. All octopuses are marine (live in the ocean).
no all reptiles does not have ribs
Yes, mammals, birds and reptiles are all vertebrates.
Yes, all Reptiles do have scales.
No, they are reptiles. ALL turtles are reptiles.
Besides other mammals, killer whales feed on birds, sea turtles, penguins, reptiles, sharks and octopuses.
all reptiles are cold blooded and are tetrapods