While waiting for someone with a definitive answer to reply I am sure you will be able to recover your shots if............... You have only deleted/erased thos precious pictures.
In DOS terms you have merely removed the initial character from the file name. The file is still there but doesn't correspond with the folder's "index"
Provided that is ALL you have done, then hopefully someone will turn up a name like Undelete which is software that will list all recent deletions by whatever name they are now, and allow you to name each file to recover it.
Formal formatting and certainly any new pictures meanwhile will ruin the chance of success.