"dsnd.mendoza" - Anyone know what this process is in macOS?

It may possibly be related to a developer by the name of Mendoza, who I believe you will find on Github and elsewhere. He is associated with the Node.js and NPM package manager projects. Node.js is a tool for building fast network applications. It’s known as a “JavaScript runtime environment”. This means that it lets you write JavaScript code that can run on your computer free of any web browser. If you at any time had a need to install Node.js and NPM on your Mac -- either via the Terminal or via the Mac installer package -- that process you are seeing may possibly be related to that.

You are welcome, my friend. The reason I mentioned that is because a while back, I was required to install both Node.js and NPM for a software installation that I was doing, and the name Mendoza rang a bell in the back of my mind. It pays to be careful, and to know what is running on your machine.

Thanks very much @wordweaver777! Appreciate the insight.