Shearer's XXX Team:
While at the team creation screen enter SEXY FOOTBALL as a custom team name. Under "CHT1" Shearer's XXX team will
appear. 

Big Head Mode:
While at the team creation screen enter TOP HATS as a custom team name. 

Bonus Teams:
To unlock 24 more teams enter PREM CLUBS at the team creation screen. 

Joke Teams:
To unlock 24 funny teams enter TFF TEAMS at the team creation screen.