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The back face of a transforming double-faced card usually has a color indicator that defines its color. Colorless back faces, such as lands, do not.

A transforming double-faced card enters the battlefield with its front face up by default, unless a spell or ability instructs you to put it onto the battlefield transformed or allows you to cast it transformed, in which case it enters with its back face up.

Except for the listed exceptions, the tokens created by Grist, the Plague Swarm's last ability copy exactly what was printed on the original cards and nothing else. They don't copy any information about the objects those cards were before they were put into your graveyard.

If a card copied by one of the tokens had any "when [this creature] enters the battlefield" abilities, the appropriate token also has those abilities and will trigger them when it's created. Similarly, any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities that a token has copied will also work.

Each face of a transforming double-faced card has its own set of characteristics: name, types, subtypes, abilities, and so on. While a transforming double-faced permanent is on the battlefield, consider only the characteristics of the face that's currently up. The other set of characteristics is ignored.

You can activate one of Grist, the Plague Swarm's loyalty abilities the turn it enters the battlefield. However, you may do so only during one of your main phases when the stack is empty. For example, if Grist, the Plague Swarm enters the battlefield during combat, there will be an opportunity for your opponent to remove it before you can activate one of its abilities.