“North Korea says the missile could carry a large nuclear warhead.

Kim Jong-un said the ICBM test completed his country’s strategic weapons capability that includes atomic and hydrogen bombs, the state KCNA news agency said”

Yeah, if by large you mean physical size then Lil Kim is correct, as his crude nukes are large in size, but low in yield like the first crude fission bombs built 72 years ago during WW2 that the DPRK has only recently been able to match.

As for hydrogen bombs, they don’t have any unless the KCNA news agency mistranslated the Korean word for “fizzle” (dud) which was what their so-called H-bomb test was….