ES File Explorer shows that these apps are already installed on my LG Tribute, but I don't see them on the screen with the preinstalled apps, and I don't see how to open the apps on the SD card.
Welcome to Android Central! How did you install these apps to begin with? From the Play Store? And after they were installed, did you move them to the SD card by going to Settings>Apps, selecting the app, and tapping Move to SD? That's the only way to have an app on the SD (and it's always just a portion of the app, not the whole thing).