Neotrup Deckling

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Just the original creatures, as the tokens were never declared as attackers. As for the buff the originals get, you can stack the triggers such that any number of the tokens are counted, and stack it such that each attacking creature counts a different number of them. Realistically this just means they'll all get the buff for the full number of tokens, but you can stack it differently if you like.

Sorry, I'd missed the initial question, yes, they'll be on top of your library by the time you draw, so you'll draw the cards you discard. Most likely, you'll want to discard to grave to actually get new cards, but if your hand is good, or all land and you need the tokens, Library of Leng can help.

You could cast Bioshift in response by "holding priority," but you would need to announce it: "I'll cast Essence Harvest and with that on the stack Bioshift from my Hydra onto my Corpsejack," however this runs into the same problem of an opponent being able to remove the Corpsejack Menace after Bioshift resolves before Essence Harvest does, and gives the opponent more information up front.

Since the characteristics aren't defined, they are not lands. If you discard two cards to the top of your library, you'll get two tokens.