To je František? = 'Is that František?' On je František? = 'Is he František?'
No. Not really. You could only use TEN in such a sentence if you were to choose from 3 men which one is Frantisek. In such a case you could say both TO JE and TEN JE but as a reply to WHAT is it... it would always be TO. As a reply to WHICH is it. you can say TEN.