A
In the US and Canada, we just use the T suffix for all of them.
There are also tender tanks (suffix TT). This means that the water is carried on the engine but the coal or other fuel in the tender. These are not common.
There's also the well tank configuration, with water carried between the frames. This is indicated by the suffix WT. I don't know if any engines in Thomas the Tank Engine are well tanks.tank engine means that it is a tenderless loco (the water tanks are on the side and - normally- coal "bunker" behind the cab). The wheel arrangment has a "T" prefix afterwards.
You get different tanks- Thomas is a normal tank engine. Thomas is known in proper railway terms as a 0-6-0T.
A pannier tank has it's tanks on the side too but not connected to the running board- like Duck?? Duck?? is known in railway terms as a 0-6-0PT.
A saddle tank (like Percy) has it's tank over the boiler. In railway terms 0-4-0ST.
In the US and Canada, we just use the T suffix for all of them.
There are also tender tanks (suffix TT). This means that the water is carried on the engine but the coal or other fuel in the tender. These are not common.