With the Exception of the Mound King as a Summon (which is hardly considered national specific) only Broken Empire Ermor, Carrion Woods and DT's use living national troops as well as Reanimators for their armies.

What other nations can reanimate with their initial summons and have the option of buying and using normal troops?

Just because you can summon undead units doesn't suddenly make the nation more 'deathlike'. A good example is BK and S&A. Mostly because of the ease of free troops with reanimation is why there is special consideration.