Several cool-ants can be found in the KGP's secret bunker on the Iceberg during Back to the Freezer. They are being used in research on how to freeze the entire planet. They are found only in the past version of the bunker.
Near the quest's climax, several cool-ants escape, forcing the penguins to flee in the T.A.R.D.I.S. earlier than initially anticipated.
- Their name is a pun on 'coolant'.