frugal is the typical installation method for Tiny Core. That is it is not a traditional hard drive installation, which I call "scatter mode", because all the files of the system are scattered all about the disk.
With frugal, you basically have the system in two files, e.g., bzImage and tinycore.gz whose location is specified by the boot loader. Additionally, a writable /tce directory for extension downloads and subsequent loading whether upon boot or ondemand.
With grub4dos starter pack, typically used in a Windows environment, frugal wouid mean that bzImage, tinycore.gz and tce directory are in a separate partition. You can use Windows to shrink the Windows partition to make room for Tiny Core.
grub4dos, also offers embedded. This would allow bzImage, tinycore.gz, and tce directory to reside within the Windows file system. No separate partition needed!
grub4dos does overwrite the MBR with a grub4dos menu to allow booting both Windows and Tiny Core whether frugal or embedded.