Sure, why not?
Feel free to submit book titles before the submissions are even announced. But make sure to leave enough empty slots (there's a cap of 100 answers) for the finalists when they eventually do get announced.
The reviews are anonymous to facilitate unbiased judging, so make sure not to leak your identity by submitting the name of the book you're about to review.
THE FINE PRINT
If Scott enters the contests, wins, and then disqualifies himself I WILL RESOLVE TO SCOTT ANYWAY.
If multiple people review the same book, and someone has blind-submitted the book title here before seeing the list of submissions, that submission will be matched to whichever one is designated as Review #1 in the submissions doc. In theory you could submit a second blind guess labelled "[Book Title] Review #2" just in case any given book gets reviewed twice but please don't do that, there's an answer limit.