Hello Tarun,
As far as my experiences go, there is no confreg or similar command available in the Catalyst bootloader. Note that technically, Catalyst switches do not have ROMMON - rather, they have a basic bootloader. While the ROMMON allows for quite sophisticated debugging and tracing of the IOS operations (provided you also have developer information a particular IOS image build), the Catalyst bootloader is only capable of basic recovery functions.
The list and description of all available bootloader commands for 3750 Catalysts can be found here:
http://www.cisco.com/en/US/docs/switches/lan/catalyst3750/software/release/12.2_58_se/command/reference/bootldr.html
Performing the password recovery on Catalyst switches is different from routers. With respect to the config register, you do not rewrite its value in the bootloader but instead, you rename the configuration file config.text stored in the FLASH (yes - these Catalysts do not have NVRAM; they only emulate it in FLASH, and the config.text file stands for startup-config) to some other name, and let the switch continue booting. The password recovery procedure on Catalysts does not involve the configuration register at all - at least on fixed-config switches.
Best regards,
Peter
