Ivan Toney and Nathan Collins clashed on the pitch at the final whistle.
Frank said: "Both of them are very competitive and I don't know exactly what they discussed.
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"But it was a little bit heated. If you can't do that then you are not in it together. It's fine. It's a little bit of friction and then you move on again."
He added: "Overall another good performance. There are a lot of positives to take from the game. I'm really looking forward to celebrating with the players when we get that next win. That's definitely around the corner. We just need to keep doing what we're doing."