Hi Sami,
team leader, project coordinator, project manager... these are all roles in the business enviroment.
So I have often seen a combination of theses roles in jobs.
For example a team leader who should also act as a project manager for department related projects is common
or a team member who is next to his doing ongoing operations also acts part time as a coordinator for a project.
From my point of view it is difficult for the staff to do so and you need skills like self-management...
In the PMBOK you will find more information about this information in the chapter 2.1.3 Organizational Structures
on page 21-26.
Cheers
Sven