Does jeet kune do and muay thai both include grappling techniques?

Muay Thai has something called clinch wrestling which in itself could be another sport. It involves taking control of your opponent's head/ neck and gaining leverage. From the clinch, you can sweep, throw, or shoot in some knees. There is no ground fighting, however. Just stand up grappling. JKD has a good degree of grappling as well but I'm not too well-versed in that.