The referenced skills of each Hand of Emrakul and Broodwarden are referring to creatures with the creature varieties Eldrazi and Spawn. Cards solely confer with the names of objects utilizing a format like on Festering Newt, explicitly saying “named [some name]”. This is roofed by rule 109.2:

If a spell or capability makes use of an outline of an object that features a card sort or subtype, however doesn’t embrace the phrase “card,” “spell,” “source,” or “scheme,” it means a everlasting of that card sort or subtype on the battlefield.

within the case of each Hand of Emrakul and Broodwarden, the descriptions “Eldrazi Spawn” and “Eldrazi Spawn creature” encompass varieties and subtypes, so that they imply permanents of these varieties and subtypes on the battlefield.

When a card like Awakening Zone creates an Eldrazi Spawn token, it’s making a token with the creature varieties Eldrazi and Spawn, and the title “Eldrazi Spawn Token”. This is due to rule 111.4:

A spell or capability that creates a token units each its title and its subtype(s). If the spell or capability doesn’t specify the title of the token, its title is similar as its subtype(s) plus the phrase “Token.” Once a token is on the battlefield, altering its title doesn’t change its subtype(s), and vice versa.