Can I have multiple favicons in D7
You're looking for the Head Module:


  This module provides a range of metatags that can be added to the
  document head of each available theme.
  
  In an attempt to keep themes clear of anything that could be
  considered optional, i have aggregated all the frontend related
  metatags you could ever need into one advanced theme settings page
  which can be found at admin/appearance/advanced