no this is not possible. you would have to do this some other way. The webbrowser control only loads documents/navigates to sites - thats its functionality.
you could try using the Document.Forms[index].ScrollIntoView(true); method, however not sure if the frames of the page will be indexed as forms.
Even better perhaps, use the Document.Window.Frames[index].Focus() and see if this will focus to the frame you are after