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Falls ein oder mehrere Spielsteine unter deiner Kontrolle erzeugt würden, werden stattdessen jene Spielsteine plus ein 1/1 grüner Frosch-Kreaturenspielstein erzeugt.

, opfere einen Frosch: Lege eine +1/+1-Marke auf Quina.
You don't need to control the spell or ability that creates the tokens, but you do have to be the one creating the tokens for Quina's first ability to apply.
The additional Frog token won't have any abilities the other tokens were created with. Anything else specified in the effect creating the token (such as tapped or "Exile that token at end of combat") applies to both the original tokens and the Frog.