100x (1.5Mt range) was done and is still fielded (1.2Mt, B83), but teller wanted to make 1000000x bigger one (10 gigaton range). it was based on a flawed understanding of several things in thermonuclear weapons but teller never let it go. the bit that worked was done by somebody else (stanisław ulam)
teller also wanted to make it a salted bomb but this is nonsense and not how neutrons work at these energies