Is my pacman frog done growing?

I have had my pacman for four months now, he was about half dollar sized when I got him. He is currently about the size of an american toad. Will he continue to grow? I've just noticed his growth starting to slow down. I was just wondering because about a month ago he started to croak. Does this mean that he has reached ual maturity? Do they stop growing at this phase? The adults that I see in the pet stores are 2 to 3 times his size.