Can a husband and wife that are not able to roll their tongues produce a child that is able to roll their tongue?

Yes, a husband and wife who cannot roll their tongues can still have a child who can. Tongue rolling is often considered a genetic trait influenced by multiple genes, so it's possible for their child to inherit the ability to roll their tongue from other ancestors who possess that trait. Additionally, genetic variation and recombination can lead to unexpected traits in offspring.