|Date of birth||3 August 1987|
|Place of birth||Potsdam, East Germany|
|Height||1.87 m (6 ft 1 1⁄2 in)|
|–2001||1. FC Turbine Potsdam|
|2005–2006||Energie Cottbus II||12||(1)|
|2006–2007||Hertha BSC II||31||(4)|
|2007–2010||SV Babelsberg 03||87||(45)|
|2015||1. FC Heidenheim||10||(1)|
|* Senior club appearances and goals counted for the domestic league only and correct as of 14:36, 22 December 2016 (UTC).
Frahn began his career with Energie Cottbus, and made one 2. Bundesliga appearance for the club, replacing Markus Dworrak in a 5–2 win over Alemannia Aachen in 2005. A year later he joined Hertha BSC, where he spent a season playing in the reserve team in the Regionalliga Nord, before making the short journey to his hometown, Potsdam, to sign for SV Babelsberg of the same division. His third season with Babelsberg was hugely successful – he finished as the league's top scorer with 29 goals, and the club finished as league champions, earning promotion to the 3. Liga.
Despite Babelsberg's promotion, Frahn opted to stay in the fourth tier, signing for big-spending RB Leipzig along with strike partner Stefan Kutschke. He is the captain of the Red Bulls, and memorably scored a hat-trick to eliminate VfL Wolfsburg in the first round of the 2011–12 DFB-Pokal. He finished the 2011–12 season as Regionalliga Nord top scorer for a second time (with 26 goals), but the club missed out on promotion, finishing in second place behind Hallescher FC. In the 2012–13 season, RB Leipzig entered the re-formed Regionalliga Nordost, and won the division unbeaten, with Frahn again finishing as top scorer with 20 goals. They beat Sportfreunde Lotte in a playoff to secure promotion to the 3. Liga, although Frahn missed both legs of the tie. He scored the club's first ever 3. Liga goal, in a 1–0 win over Hallescher FC on the opening day of the 2013–14 season. His sixth goal of the season came ten seconds into a home-match against VfB Stuttgart II: seven Leipzig players stormed the Stuttgart half immediately after kick-off; the ball was played back then a long-ball was hit forward to Matthias Morys, who crossed for Frahn to score. RB Leipzig went on to win the match 3–1. Frahn ended the season as the league's secondtop scorer with 19 goals, behind SV Darmstadt 98's Dominik Stroh-Engel, as the Red Bulls were promoted to the 2. Bundesliga as runners-up.
- "D. Frahn". Soccerway. Retrieved 30 June 2013.
- "Seven-man attacking kick-off results in goal for Red Bull Leipzig in under 10 seconds - video". The Guardian. 18 September 2013. Retrieved 18 September 2013.
- "Blitzstarter Frahn stellt die Weichen früh auf Sieg" [Frahn's Blitz start sets the course for victory] (in German). kicker. 14 September 2013. Retrieved 18 September 2013.
- "Heidenheim holt Stürmer Frahn". sport1.de. 10 June 2015.
- "Frahn wechselt mit sofortiger Wirkung zum Chemnitzer FC" [Frahn to Chemnitzer FC] (in German). 1. FC Heidenheim. 5 January 2016. Retrieved 5 January 2016.