From Progarchives.com:
Frankie Dymon Jr. was a kind of 'project' led by Frank Dostal and Achim
Reichel, previously members of The Rattles, one of the most well-known
German beat groups, and Wonderland. Under the name Frankie Dymon Jr. they
recorded one album in 1971, titled Let It Out, for which Reichel wrote most of
the songs and produced the album (engineering was by Konrad Plank).