Yeah, he was.
I actually learned about Pat Morita's career in reverse order. lol
When I was younger, I only knew him as an actor. First as a kid, I knew him as Mr. Miyagi. Then as I got into my teens, I leraned that earlier in his career, he was Arnold on Happy Days.
It wasn't until later on that I was an adult that I learned of still earlier in his career that he was a stand-up.