Can Linux Access OS/2 HPFS Partitions?

Yes, but Linux access to HPFS partitions is read-only. HPFS file
system access is available as an option when compiling the kernel or
as a module. See the Documentation/filesystems/hpfs.txt file in the
kernel source distribution. ("How To Upgrade/Recompile a Kernel.")
Then you can mount HPFS partition, using, for example:

$ mkdir /hpfs
$ mount -t hpfs /dev/hda5 /hpfs
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