Does Frank seem to encourage Taplow’s comments on Shrivelled up?

Yes, Frank encouraged Taplow’s comment on Shrivelled up. When Taplow was telling about Crocker-Harris to Frank that “Crocker-Harris is a person who was shrivelled up inside like a nut and he seems to hate people to like him.” Frank very cleverly encouraged Taplow to speak more about Crocker-Harris by asking several questions. He also repeated the name “Crocker-Harris” while conversation between him and Taplow so that Taplow speak something more about Crocker-Harris.