is it possible to call hook_blocks from within the code of a page ?

let me explain myself :

i'm trying to get displayed in certain nodes what i would normally find in blocks ; more specifically, the very commmon "who's new" and "New forum topics"

But i don't want them to appear in blocks, rather in specific nodes. how can i call these functions without having to use snippets ?

i am already using this snippet for the last active forums : http://drupal.org/node/23234

but the reasonning is : why use a snippet when a function is already available ?