Dada?

How can I encourage my LO to say Dada? Or Dad or anything in reference to his father?

I’ve tried saying it and pointing at his dad. Showing him pictures when he is working etc

He says LOTS of words most of them random.

He was calling his Dad RaaRaa for a while (don’t know why) but that’s stopped

He has called me mamma/mum since 5 months old. He is one next week.

He can say Mamma/Mum, hello, hiya, Cat, oh god, get it, bye bye, Apple (?), nana ( 🍌) etc

He does have a posterior tongue tie I don’t know if that is any relevance