The problem may be due to name completion in the mysql client. To work around this problem, start the MySQL client with the --skip-auto-rehash option and try DROP TABLE again. (With name completion on, MySQL tries to construct a list of table names, which fails when a problem such as just described exists.) If you are still have the problem you may apply this one solution https://www.repairtoolbox.com/mysqlrepair.html
Good luck