Most FIPS modules will require an RNG (random number generator) for things like key and nonce generation and so will require entropy certification for the noise source within the RNG.
FIPS references SP800-90A for the random number generator requirements. SP800-90C is still in draft form at the time of writing, and SP800-90B is in a revision process and so will have some updates in the 2024–2025 time period.