This application name is FNF Yoshi Mod Wallpapers.
There are 10 FNF Yoshi mod wallpapers inside this wallpaper application.
All wallpapers are different from each other.
Choose the wallpaper you like from the application's menu, click on it to see it.
Take screenshot above the wallpaper you like and set it as wallpaper from your gallery.
Everything is that simple.