Sulcata coughing?

So my male sulcata Lulu (didn't know he was a male until about a month and a half ago) has been making these weird coughing noises. He doesn't make them every day or even all that much when he is coughing. It sounds almost like a cat trying to cough up a hairball. He also seems to do it around the mid afternoon.

He still eats and runs around like normal. Only diference is the weird cough. I think it happens more after he's eaten? I dunno.

I'm not sure of its a respiratory infection. There's no mucus in his nose or runny eyes. His tongue is still a nice and healthy pink.

Someone suggested that he did just discover his manhood and that he is just being vocal, but it still sound like a coughing hack.

Any ideas?