Bola/trap other creature. And let this long guy attack them, but dont let him kill it. And boom! easy taming for almost any creature. 3-7 hits of them is enough to unconscious a therizino, depends on therizino levels
You can pick these up with an argy, and fly to an enemy or an enemy base and drop it in there. The tribe log will only say a wild titanaboa killed their Dinos. This doesn’t work if they aren’t on passive
Ark mobile: If you want to farm Boa eggs here is a very basic way to do it. But you will need an Argentavis. Make 3×3 stone wall structure or cell with one door way, three storied high and make it on open natural floor or grass or soil without the housing base structure. Use foundation railings. If your structure is in open area or outside base walls where wild dinos can come then make walls around the structure with one door way , atleast one wall wide. Make a second one of this adjacent to the first one. Pick and drop the snake to the adjacent cell with Argy for collecting the eggs.