They do not fit the description of the northern kingdom in appearance whatsoever for they simply are not black people.
That proof should be obvious.
If you are trying to locate the true lost tribes, you should be looking for a group of black people, not a group of gentiles.

Mexicans aren't lost (away from home), and Native Americans know that they made America their home after crossing the Bering strait.
But the lost tribes do exist, if you know the basic principles to look for.
The people whom you are speaking about are still black, still the descendants of slaves,, still displaced away from home, and still worship the same false god (s) they were conditioned to worship over 2700 years ago by the same heathens who enslaved them back then, and who still rule over and oppress them in 2015.