The idea that the Uralic or Finno-Ugric languages (Hungarian, Finnish, Estonian, and others) and the Dravidian languages have any connection seems to be a minority view. The homeland of the Uralic languages and the homeland of the Dravidian languages, even assuming the latter were more widespread before the Aryan invasion of the Indian subcontinent, are pretty far apart. The only distant language which is sometimes thought to be related to Dravidian is Elamite, and that seems to be unproven.
Harappan is thought to be connected to Dravidian and Elamite too, but it’s also unproven.