Google image search mostly try "Hollywood Hobby Horse Harold Lloyd Antique Toy Wooden Ride On Horse" "walking horse" "Hollywood Hobby Horse" this is where i start.
A reverse image search can work to if you have a pic I drag and drop in search bar and it will show the same or similar images and go from there.
Most search finds are links to antique stores actin houses and E bay.
I save all pics/images of things i like and put in a folder " hollywood hobby horse" for later use as most stuff and info we look up is not always there when we want it.
Here are some links http://www.oldwoodtoys.com/new_page_31.htm
Sorry can't find the link to the under side pic. It must be gone, mite have been e bay but not shore and the revers image search is not working so it mite be gone.
I did save some more pics of that horse but the under side was the most relevant.