Pacmans don't get that big, its their cousins that get huge. A Female will reach 4-7 inches when full grown, while males will stay much smaller at 2.5-4 inches.
Granted for me this is not a big frog, but a relatively small frog compared to the others I've kept in the past.
"And 5, very important 5... Don't let me eat pears.. I HATE PEARS."