Neither is correct because the verb is wrong. If you mean the present tense, use "who forbids them?" In past tense, use "who forbade them?" In present perfect, use "who has forbidden them?" Both to and from can be used, but keep in mind where the action of eating is in relation to the forbidding. For your question, it should be, "Which one is correct?" Keep it simple and clear and you'll make less mistakes.

Forbid can be the past tense of forbid, in American English at least. Today I forbid them to eat chicken. Yesterday I forbid them to eat chicken. Today I forbid them from eating chicken. Yesterday I forbid them to eat chicken. In addition to forbid, other forms of the simple past for forbid are forbade and forbad. In American English, the simple past of the verb forbid can be all three: forbid, forbad, forbade. It is unusual to have three forms for the simple past tense. But I think it is because to some people, forbad and forbade sound strange, whereas forbid sounds better. http://dictionary.cambridge.org/us/dictionary/american-english/forbid shows the past tense as forbade, forbid. But forbad is also said by many people.