Yes! Fleep teams can have admin controls with Fleep for Business.
In the free version of Fleep, all teams are democratic - all team members can change the team settings, add and remove team members, as well as add and remove team conversations. This self-organizing team setup works well for a lot of teams, with low administrative overhead.
If you need admin control over the team settings and membership, try out Fleep for Business. Among other administrative features, you'll be able to make sure only admins change the settings and membership of teams. You can get started at fleep.io/admin.