Can i retrieve deleted photos - Polaroid a800 Digital Camera

Of course, you can. In fact, after the deleting process, the deleted photos on the camera memory card are not actually wiped out as you normally think. They are still stored on the memory card and only become invisible. But, they cannot be there forever. They can be rewritten by anything new on the same memory card. So, you should take care.
Plunge this camera to your computer and download a deleted photo recovery freeware to help you out:
http://blog4mark.blogspot.com/2012/12/photo-recovery-after-delete.html
I believe this data recovery freeware can work perfectly on your memory card just in the same way as it completely retrieves all the deleted data of my friend off from his phone memory card. Just give it a shot!
Directly download this freeware here:
http://www.freeware-fix.blogspot.com/2013/02/photo-recovery.html
PS: If you don't want to encounter the similar data recovery problems, you'd better back up everything important well in the future.

If you are using a memory card, take no more pics until you've recovered the photos, take the card out of the camera. This is to reduce the chance of you overwriting some of your "lost" photos. There are many good freeware photo recovery software options that are available to help you recover your photos. This blog article reviews and outlines several of the better ones.