Over the first few seconds of “Percolator,” 438 Tok seems to be probing for the best beat to hang his verse on, like a kid playing Double Dutch searching for the exact moment to slide between the ropes. Then, suddenly, everything clicks. He jumps in with full force, his undulating flow building a swelling momentum from the moment he sets off. Backed by long-time friends Hotboii and Rico Cartel, the West Orlando native is surely on his way to the top.