The latest version of swank-chicken.scm now supports describe (C-c C-d d) and apropos (C-c C-d a) commands using the chicken-doc egg. Here’s an example:

This apropos window works too: hit C-c C-d a, type a regexp, and a popup window will list the matching symbols; hit enter on the one you’re interested in and you will see the documentation.

Note for all this to work you will need to have the Chicken documentation installed – follow the instructions on the wiki.