Question

What are the English names for Landorus and the other two in Black and White 2?

Answer 1

Their English names are Tornadus, Thundurus and Landorus.

I assume you're asking about the forms? In BW2 they each have a new form which is the Therian form in English, with the original forms from BW1 being called Incarnate form.

Answer 2

Landorus, Thundurus, and Tornadus.. are the English names.

There Japanese name would be as follows:

• Landros, (Landorus).
  Voltolos, (Thundurus).
  And Tornelos, (Tornadus).