Tight Line tackle makes a T-Rex jig that is very similar in head design but they only make it in heavy designs for walleye fishing.
I used to make and sell jigs for walleye fishing so I am pretty familiar with the different molds out there. I took the liberty of going through some old stock and could not come up with this exact mold. I know the T-Rex jig is proprietary and this head is very very similar which leads me to beleive that the molds were probably cut by the same person.
The bait holder is the "ring" design. You could come close to it with other molds but not exact! I know that doesn't help you find them but at least it gives some information.
I have OCD "Obsessive Crappie Disorder"