If the "is" follows the word that is associated with the "too" - shouldn't it be "Here, too, are some apples"?
"Néhány" is a few, "valahány" is an unknown number. It can be a lot. But it carries the feeling that it is not too many.
Would it as much as between ' a few apples' and 'some apples'?, only one accepted.
I too think it should be here too, are some apples. But the authors too think not.