A reliable leaker has provided what is purportedly the codename for the Nintendo Switch Pro's chip: "Dane". Along with this surprisingly informative name, the same source has stated that the Switch Pro's processor is based on an 8 nm process, suggesting big energy efficiency gains over the Nintendo Switch revision.

https://www.notebookcheck.net/Switch-Pro-chip-s-supposed-8-nm-fabrication-process-promises-marvelous-efficiency-gains-over-the-revised-Nintendo-Switch-console.548239.0.html