Congressfolk means: An informal, gender-neutral collective term for members of the US Congress - covering both representatives and senators regardless of gender. It's part of the broader shift away from gendered. There is no real cause for parental concern; it is descriptive vocabulary rather than risky behaviour. If your teen uses it, context will usually make the intent clear. A short, curious question about where they heard it is usually all that is needed to know whether to follow up.