Where I work there have been "Stop, start, continue" meetings about managers and team leads that seem to work well as a place to give feedback that the terms could be translated into questions like this:

• What would you like the team lead to stop doing that should be stopped?

• What would you like the team lead to start doing that isn't happening right now?

• What would you like the team lead to continue doing that is working well?

The idea is for the team to discuss without the manager or team lead present so that consensus can be built in terms of how various practices are viewed. Perhaps someone really likes the team lead bringing in cookies each week and someone dislikes it strongly, just to give a simple example.