Aggro the snake while on a bird, drop a fertilized egg and wait for it to get close. Immediately fly straight up into the sky and it should lose interest in you fairly quickly and go after the egg. Repeat until tamed!
*make sure nothing else is around for the snake to attack*
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)