Some of them - yes, some others not. There is some gluing magic in place which has to be written for every C++ function and class in order to make them visible on the perl side.
To get an overview of what is already available from the interactive shell and scripts, you can browse the interactive help system. For example, change to application "graph" and enter help "functions/ or help "objects/ then use TAB completion to see the proposals. Or look at the release documentation at https://polymake.org/release_docs/latest/graph.html
, it contains the same information.
If a function that you are looking for is missing, it will probably be possible to provide the missing glue, but it's a too vast topic to be explained in a single forum post. The general procedure is explained here: https://polymake.org/doku.php/user_guid ... on_to_perl
for functions and here: https://polymake.org/doku.php/user_guid ... pe_binding
for classes, but this stuff is more oriented at experienced polymake developers. Maybe you just ask concretely for things you need.