Turn Aside and Noxious Gearhulk
No, Turn aside cannot counter Noxious Gearhulk.

There seems to be some confusion here. When a player plays a creature spell such as the Gearhulk, it is indeed a spell while it is on the stack and does fulfill one of the conditions of Turn Aside's possible targets. However, a creature spell (generally, all permanent spells except Auras) never targets anything, and is therefore never a valid target for Turn Aside. A creature spell is simply on the stack, and when it resolves, it puts the creature it represents onto the battlefield.

Only the Gearhulk's enters-the-battlefield ability can target something. It goes on the stack when the Gearhulk has resolved and entered the battlefield. However, an ability is not the same as a spell, Turn Aside can counter only spells, so Turn Aside cannot counter that ability either.