The comprehensive rules arguably don't clarify enough whether the text "you would create one or more Treasure tokens" on Xorn is intended to mean "you would create one or more tokens that are Treasures". None of the rulings for Xorn, Academy Manufactor, or Jolene, the Plunder Queen (currently the only cards with effects that care whether "you would create ... token[s]" of a particular kind) clarifies this matter. (See also Vazi, Keen Negotiator.)
Note that effects that say to create a "Treasure token" create a "colorless Treasure artifact token with" a particular activated ability, by default (C.R. 111.10, 111.10a). Thus, the name of such a token is "Treasure Token" by default (C.R. 111.4). Although C.R. 111.10a defines what a "Treasure token" is for this purpose, it arguably doesn't define what a "Treasure token" is for other purposes, including for purposes of Xorn's "If you would create one or more Treasure tokens".
See, for example, Intangible Virtue, which applies to "[c]reature tokens you control".
You end up with a Clue, a Treasure, and a regular Food.
So extrapolating that, and since Xorn is worded a bit different, you'd end up with a Goldhound token, and a regular Treasure token.
edit - I think the key here is that Goldhound still has the subtype Treasure, so it still triggers anything that cares about Treasures or Treasure tokens. But, the cards like Xorn always create the generic tokens, rather than full copies of the creatures, or in Academy Manufactor's case, replace the creature copy with the generic Treasure/Food/Clue.
The only part of the rules that mentioned predefined tokens is 111.10, which begins:
"Some effects instruct a player to create a predefined token."
This concerns being instructed, and so is not in the scope of interpreting the first half of a replacement effect, which is a matter of recognizing an event.
It does tell you what the second part of Xorn's ability says, and this is perhaps the reason these abilities have been written assiduously to create "an additional [predefined] token" instead of to create a token in the form of being "twice as many".