I am looking also for journeymen players
Marius Wolf
If 2. Bundesliga is included, I found some more. Probably some of the clubs were even in first division during that time. At least all of them were at some point.
Ivaca Olic (Hertha, HSV, Bayern, Wolfsburg, 1860) Sandro Wagner (Bayern, Hertha, Duisburg, Bremen, Hoffenheim, Kaiserslautern) Albert Streit (Schalke, Frankfurt, HSV, Wolfsburg, Köln) Andriy Voronin (Mainz, Leverkusen, Köln, Gladbach, Düsseldorf) Julian Schieber (BVB, Hertha, Stuttgart, Augsburg, Nürnberg) Mitchell Weiser (Bayern, Köln, Bremen, Hertha, Leverkusen, Kaiserslautern) Leonardo Bittencourt (BVB, Köln, Bremen, Cottbus, Hannover) Luca Waldschmidt (Freiburg, Wolfsburg, Köln, Frankfurt l, HSV) E.-M. Choupo-Moting (Bayern, Schalke, Mainz, HSV, Nürnberg) Kevin Vogt (Hoffenheim, Bremen, Bochum, Köln, Augsburg) Mike Hanke (Gladbach, Schalke, Hannover, Freiburg, Wolfsburg) Max Kruse (St. Pauli, Bremen, Freiburg, Gladbach, Wolfsburg, Union Berlin)
Honorable mention: Claudio Pizarro played 5 seperate times for Werder Bremen
Leo Bittencourt is at 5, you missed Hoffenheim.
Claudio Pizarro hatte aber ein ganz anderes Heimweh zu Werder
Michael Gregoritsch
Max Kruse
Kicker slideshow: The biggest journeymen of the Bundesliga
Transfermarkt: Bundesliga journeymen stat
First who comes to mind is Max Kruse, who is now at Paderborn iirc
Others would be Maximilan Philip, Leonardo Bittencourt, Davie Selke and Waldschmidt
Maxi Philip didn‘t play for 5 Clubs in the Bundesliga.
Mitchell Weiser is a good one. I think Luca Waldschmidt has bounced around quite a lot too.