What is Nottingham forest mascot?

The Nottingham Forest mascot was originally 'Nutty the Squirrel' (who wore a Robin Hood-style hat) before being replaced with 'Sherwood Bear'. Robin Hood became the club's third mascot at the beginning of the 2007/08 season.
In their 150th anniversary season 2015/16 they reverted by to the much loved Sherwood Bear, albeit with something of a makeover.