I'm busy posting my fanfiction at other forums that are not associated with LBT. (Risky, I know.) However, since they don't associate much with LBT, I have to put up what kind of dinosaur the charcters are.

For one place, I have put up the chapter where Rooter appears.  However, I have forgotten what he is.  So, a little help here?

Thanks in advance. :^.^:

I always thought he was the same species as Spike, but then again that was when I was about four or five.

He looks like some kind of ankylosaur.

I've had people say he's a Nodosaurus.

nodosaurus? Isn't that what one of the bullies is from the 3rd movie?  I thought one of their names may have been Nod.

Yes, but that doesn't mean a Nodosaurus couldn't appear before.

True, I just meant if one of the bullies was that type one could compare that character to Rooter to see if they look very similar enough to be the same species.

He could be an old Nodosaurus

The bullies would correspond to 15-18 in human years while Rooter would correspond to 70+ in human years.

I don't think Rooter is mentioned on the official page. However, the official sources are not exactly incontestable if it comes to naming any characters species. Some official sources even contradict each other. Ducky for example was said to be an Anatosaurus in a file that was issued to the press back in 1988 (she can't be, as that species didn't have any crest), while the official page claims her to be a Parasaurolophus (very unlikely if we compare her and her parents to the Parasaurolophus shown during the LBT 4 song "Grandma's lullaby), and other sources have named her a Saurolophus (the species which I suppose comes closest to the outward appearance of Ducky).
I have seen Littlefoot named a "Brontosaurus" (a name that was mistakenly given to a species that had already been discovered and dubbed Apatosaurus) or a Brachiosaurus in official sources.
Petrie too appears as a Pteranodon in one and a Pterodactylus in the other source.
Somewhat overenthusiastic fans too cast their opinions in claiming them to be facts. Littlefoot for example was claimed to be an Alamosaurus by some fans in order to find a sauropod that lived in the Cretaceous same as Ducky and Cera would have.
The use of science in LBT matters is questionable. It can be fun to try to apply science to LBT, but if one takes such attempts serious one is bound to run frustrated.

If you have a paleontologist handy you could show them a screen capture of Rooter and ask what sorts of dinos does this look like.  One could do the same for certain other characters as well.

Malte and I decided on hylaeosaurs a loong way back probably six years ago....so far, nobody has challenged it.

What do you think of the LBT name I gave his species, spikeback?  It was the best I could come up with! :

That may be a good name for what they may call turtles and tortoises.  They may call Archie a large shellback.