The polygraph operator is unlikely to be able to tell if you use tongue-biting as a countermeasure. In the available research, polygraph operators were unable to detect tongue-biting through visual observation. There is, however, a headset used by some polygraph operators in an attempt to detect jaw movement.

With respect to breathing countermeasures, it is not necessary to consciously implement them. In the available studies of countermeasures, breathing manipulations were not involved. However, because breathing is the only physiological measure recorded by the polygraph over which the individual has direct control, I think it would be prudent to employ breathing countermeasures. At minimum, one will want to avoid deep and/or slow breathing, which some polygraph operators interpret as an attempted countermeasure.

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Sorry for the late reply! Most law enforcement agencies use a probable-lie "control" question "test" (CQT) with relevant questions similar to those asked in Phase II of the federal Law Enforcement Pre-Employment Test (LEPET) format:

https://antipolygraph.org/documents/ncca-lepet.pdf#page=12