I dropped eggs from my wyvern near them and it didn't work. Then I dropped the eggs from myself when I was standing up. It worked. I dropped Rex and Wyvern eggs which was fertilised. It went for the Rex eggs.
You tame them by droping ferti eggs from your inv on the ground. You need to do so when the snake is not aggroed, so sit on a rex or smthing it wont attack. Be sure to drop them from your inventory, not from dino ones, that will make it bugged, it wont eat. To a lvl 20 Rex egg gives 29% on 2x event, bronto 26.7% and giga and wyvern the same, looks like all the big eggs give approxymately the same amount.. so dont waste the best you have ? If they get aggroed on you just run away and return, taming wont drop. Happy taming!
If u are in ark mobile ( like me ) and u want to get titnboa eggs make a small room without a floor pick a female with an argy and drop it in the room and get the eggs (sorry if there was any grammar mistakes)
-Build a trap wooden, 3x3, 3 walls high (with entrance ramps if pve) just out side of swamp.
-Drop or lure Titanoboa inside.
-Fly up untill out of render distance to stop agro
-Fly back down, hover above (not too close)
-Drop eggs 2 - 3 at a time from your inventory not tames.
Place down the egg in a clear spot, then lead the snake to where he will walk over it. Then run away out of its target area, then let it eat the egg, and repeat. Warning, it could depend on the server, but with my snake, Dangerous Spaghetti, he will only eat eggs, not meat, when tamed!!!