No. The Association and Team tabs are built in and cannot be removed. The Team Tab (where schedules, rosters, and game results are shown) will not appear unless you have defined a season and have at least one team, however.
If you would like, you can change the names of the tab.
- Go to Admin > Configuration.
- Click Horizontal Tabs.
- To the right of the tab name, click the yellow Edit button.
- Edit the tab name as desired.
- When finished, click Submit.