I purchase these wooden figures when i was very young to decorate a dog house. Eventually each one fell off and I found myself not able to part with them. Then, I decided to glue them to thumbnails:)
Place a dab of glue to the back of each wooden figure.
Place the thumbtack on the back gently. Then rotate the thumbtack so the top is completely submersed in the glue.
Let dry air dry.
Smaller wooden figurines will require additional glue to submerge the bottom of the thumbtack completely.