Yup. There are. But you can press Escape then Options and put it on Peaceful Mode then there will be absolutely no monsters. (That's what I do)
There aren't "ancient creepers" in the application version of Minecraft, there are creepers.
It's called Minecraft... creepers have ALWAYS been in Minecraft.
No, Creepers just flee from them.
Yes, creepers were an error, they messed up a pig...
Yes
No hostile mobs (including creepers) are present in peaceful difficulty.
Nothing.
Yes
They explode once they sees you.
Kill Creepers.
Yes, they will explode.
Yes