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I never saw any jigs like that, it could be that they're tails that were bought and put on the jig heads.
Please keep us posted on how you make out with the mold and which fish hit on them. I think the easiest way to get material to make them would be to buy some tube jigs and melt them down. I'm sure there'll be some trial and error but I'm sure you'd figure it out fast. If you wanted to I'm sure there's some guys on here who'd buy some if you make them.