Torpedo chaser, 1944
This "Torpedofangboote" seems to be a small torpedo chaser of 1944 vintage. I believe boats like this drew miscellaneous harbor duties in addition to their nominal role of chasing down and recovering torpedos fired in practice.
Notice her compact size and considerable deck stowage capacity for torpedoes.
Michael Meyer (mikemike through cityweb.de) writes to add:
You have correctly described the purpose of these ships. The plan shows the TF 9 type that was built in the Netherlands; the plan was issued by Wilton-Fijenoord, a yard in Rotterdam, who built TF 15 - 18 between 1942 and 1944. A total of 16 of the type (TF 9-24) were finished, another 12 (TF 25-36) were cancelled.