If your kids were in a public place when the photos were taken, they can be posted online or published without permission from either parent. However, it is illegal to profit from the likeness of the minor without parental permission, but you do not indicate that is happening.
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Q: "Can I have them removed?"
Your first step should be to ask your former spouse for his help in removing the photographs. If he won't, then review the relevant Facebook policies [via the link below]. If none of those policies apply then speak with your own Arkansas-licensed intellectual property attorney. Good luck.
The above response is general information ONLY and is not legal advice, does not form an attorney-client relationship, and should NOT be relied upon to take or refrain from taking any action. I am not your attorney. You should seek the advice of competent counsel before taking any action related to your inquiry.
Discuss this with the father. If he will not cooperate, then request to Facebook that they remove the photos. If they refuse then your option is to see an Arkansas family lawyer for assistance. The nature of the photos will be important and so may be whether they are being used in any commercial manner and whether there is news content involved and whether the kids or either of you are.celebrities.
I am not your lawyer and you are not my client. Free advice here is without recourse and any reliance thereupon is at your sole risk. This is done without compensation as a free public service. I am licensed in IL, MO, TX and I am a Reg. Pat. Atty. so advice in any other jurisdiction is strictly general advice and should be confirmed with an attorney licensed in that jurisdiction.