Can they take your taxes if they are garnishing your wages?

The question is too vague to answer. Who, exactly, are "they", and what does "take your taxes" mean?

A creditor who has successfully persuaded a court to allow them to garnish your wages would probably be able to persuade a court to allow them to confiscate your tax refund as well, if that's what you're asking.

However, garnishment usually sets a lower bound on earnings. In California, for example, anything below about 450 per week is immune to garnishment, and only a certain percentage of funds in excess of that can be taken. So you should be able to meet your income tax and FICA withholding requirements out of the remainder.