Unable to answer "Do these traffic lights have a button to request a walk signal?" – Crossing With Pedestrian Signals – https://osm.org/node/4150033489 via StreetComplete 58.2:

There are buttons activated by touch, but without the usual screen above with text such as "Grün kommt" and no such indicator as a light on the traffic light either, leading me to believe that the buttons aren't functional.

Attached photo(s):
https://westnordost.de/p/230911.jpg