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1つ以上のトークンがあなたのコントロール下で生成されるなら、代わりに、それらのトークンに加えて緑の1/1のカエル・クリーチャー・トークン1体を生成する。

, カエル1体を生け贄に捧げる:これの上に+1/+1カウンター1個を置く。
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.