リスの将軍、サワギバ

森渡り
あなたのコントロール下で１つ以上のトークンが生成されるなら、代わりに、それらのトークンに加えてそれらのトークンの数に等しい数の緑の１/１のリス・クリーチャー・トークンが生成される。
{B}, リスＸ体を生け贄に捧げる：クリーチャー１体を対象とする。ターン終了時まで、それは＋Ｘ/－Ｘの修整を受ける。

Chatterfang, Squirrel General

Forestwalk (This creature can't be blocked as long as defending player controls a Forest.)
If one or more tokens would be created under your control, those tokens plus that many 1/1 green Squirrel creature tokens are created instead.
{B}, Sacrifice X Squirrels: Target creature gets +X/-X until end of turn.

Bloomburrow Commander

Forestwalk
If one or more tokens would be created under your control, those tokens plus that many 1/1 green Squirrel creature tokens are created instead.
{B}, Sacrifice X Squirrels: Target creature gets +X/-X until end of turn.

Jumpstart: Historic Horizons

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Chatterfang's second ability applies to all kinds of tokens, including Clue, Food, and Treasure tokens.

If an effect changes under whose control a token would be created, that effect applies before Chatterfang's effect applies. If an effect changes under whose control a token would enter the battlefield, that effect applies after Chatterfang's effect is able to be applied.

In a Commander game, the defending player is the player Chatterfang is attacking or the controller of the planeswalker Chatterfang is attacking.

The additional Squirrel tokens won't have any abilities the other tokens were created with. Anything else specified in the effect creating the token (such as tapped, attacking, "That token gains haste," or "Exile that token at end of combat") applies to both the original tokens and the Squirrels.

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 Chatterfang's ability to apply.