Thundermist Lure Company Flexi-Jig is the most direct match if you mean a flexi jig. Its pivoting head is designed to line up on the hook-set for a solid connection, and it’s described as good for both freshwater and saltwater.
Barbless Flies Jig Apps Bloodworm fits if you’re looking for a small, flexi-floss style jig pattern that imitates bloodworms and other tiny prey.