This carved head, possibly of Quetzalcoatl, looks like the ones seen at the Temple of Quetzalcoatl. This might actually be an original where the others now residing at the temple might be replicas.
A sign by the head reads:
Architectural crests or crenelations. These sculptures adorned the doorways and patios of temples and dwelling units, as well as the facades of the latter. They were placed at the edges of the roofs. The crenelations on the right have for motif the symbol of the year. Each place was decorated according to its function.
See the head-on view.