Michael
I love the Indian and see why you’d like something similar on the ends of your rafters/joists!
As you found, profiles of the green man are hard to come by, but I thought I’d give it one more try!
In the top model, I split a front view and added a nose, lips and “vineage” . The bottom one was a ¾ view I found on the web and vectored.
These aren’t 3D but are V-carvings that will cut in a fraction of the time, you can also easily add elements until you get the look you want.
A fish would likely be an easier find… you could do a whole school!
SG