kamfas kok growth are usually slow. kok growth will be visible in about half a year mybe less. unless it is a super king kamfa(9.9kamfa) which worth hundreds prbbly thousands in just 3+inch.Over the next few months he will either develop a kok or he will not. My bet is he will not. At best he might have a hard kok, but a large water kok is doubtful. But at least he should have some nice red, yellow, and orange coloration on his body so thats cool.
at fry size they look nothing like their prents. but when they get older their koks will be huge. kamfas are like that.