NOR and NAND flash memory on the same chip
I'm not aware of a chip that combines the two onto a single die like that, or a shared address space but I'm sure someone has made a multi-chip module with both topologies on-board.

To address your comment about NAND boot areas, they are special only because some NAND chips are sold with guaranteed 'good' sectors at the start, where you can store infrequently updated code such as a bootloader or other IPL. This saves you from having to juggle that critical piece of software around during normal NAND controller operations that may re-map bad blocks, etc.

I suppose someone who implemented their own memory controller in a FPGA and connected two separate parallel memories, one NAND and one NOR could implement such a device,  but that's a lot of hardware.