You can also press x to jump too. It may not be the iconic jump button, but at least you can still use your right thumb to jump if it's that important to you.
I noticed he complained about the jump button being up on the D-pad, but it really wasn't that big of an inconvenience. And I'm pretty sure they did that intentionally because the stylus was such a big part of the game.
I once had two spawn in a row, both from defeated enemies, which I imagine is pretty rare. A third one spawned from a block I destroyed later on. That's the most I've ever seen in normal gameplay. I've never actually tried farming for them.