Can a creature token represent a different creature token?
You can represent your tokens however you want with 


coins 
dice 
sleeves 
deckboxes 
your smartphone, etc
If you have different types of tokens, I normally put them face down.




But there are some things to be careful of however. (mostly applies to competitive scenarios)


If you have many of the same token, Avoid using dice to represent the quantity.  If you do this, you'll have issues differentiating tapped tokens from untapped, and tokens with summoning sickness from tokens without.  
If a card produces a token, avoid turning that card face-down for your token.  If that card is in your graveyard, your graveyard is where it belongs.  find another object to  represent your token with.  




To Summarize:  You can represent your tokens in whatever manner you want, so long as they're clearly and accurately represented.