How can I make an armor stand in minecraft PE
Solution 1:
At the moment, no, but according to the Minecraft Wiki, MC PE will be receiving armor stands in Version 1.2, the "Better Together Update" scheduled for around November.
Solution 2:
As of September 20, 2017 with Minecraft Bedrock 1.2 (The Better Together update) armor stands are now included in the game.
Which means, that you should be able to find it in your crafting menu if you have acquired all of the required items.
