No, unless they have haste.
Single cards that represent a creature (token) there are currently 199 that I am aware of.
The Coldsnap land 'Dark Depths' produces a Marit Lage token.
The artifact creature 'Pentavus' can remove its +1/+1 counters to create 1/1 flying Pentavite tokens.
Mercy Killing targets one creature, and the creature's controller sacrifices it when Mercy Killing resolves. That player then gets some Elf tokens, as outlined on the rest of the card.
Unless there is some restriction in attack, such as someone attaching "Raregold Armor" to one of the tokens, you can attack any monster on the field.
Tokens go to whichever zone, and then immediately cease to exist. So while cards which say "when a creature goes to the graveyard" will trigger when tokens go there, the tokens themselves do not stay in the graveyard, they just disappear. So no, they are not there for other abilities to bring back to the battlefield.
When you copy a creature, the token takes the creature's mana cost, colour, printed effects and printed P/T. It does not copy any external effects, bonuses or penalties on that creature, nor anything it is enchanted or equipped with. So the creature tokens created by Followed Footsteps do not themselves come with another Followed Footsteps aura.
Yes, they do count as being permanents, and will be affected by any spell or ability that can affect them.
There is two other kinds. There's monsters, and there's tokens. Tokens Look like monster cards but all of their names are "TOKEN" and they don't have attack, defense, or level.
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Tokens do not have effects, they are Normal Monsters. Even in the case of tokens with inbuilt restrictions such as Sheep Tokens from Scapegoat or other things like the damage from Ojama Tokens, these are lingering effects placed by the card that created the Tokens and not effects of the tokens themselves.
Yes they do, as they are dubbed "Creature" Token. Essentially, Riot Control is very good against populate or very high token decks "Oh so you have... 15 3/3 Centaurs? Riot Control. Thank you..."