Tied up a few of these Tom Thumb skaters. These are olive green so I call them Green Thumbs ;).  The Tom Thumb fly is an old Canadian fly. I'm thinking that back in the day, someone named Tom tied this fly up. Due to its appearance of a thumb it became the Tom Thumb. There is a great video that shows Norm Norlander tying and talking about these flies. https://www.youtube.com/watch?v=sy9e2d3rOoA