Final answer:
The texts provided mention various men but do not conclusively identify the man who stays as a roomer in Claudia and Frieda's house.
Step-by-step explanation:
The man that comes to stay as a roomer in Claudia and Frieda's house in the texts provided is not clearly identified by name but is described through various situations. In the fragments given, several male characters are mentioned, each with a distinct role, such as a lawyer, an old gentleman imagined by Nora, and a roomer whom McTeague offers to host.
It is difficult to determine which of these characters specifically refers to the roomer in Claudia and Frieda's house without more context. These excerpts mentioned involve individuals who either become roomers or are involved in discussions about staying over; however, none provide a clear connection to Claudia and Frieda or a definitive answer to the student's question.