The crab can be found in the Wimpy Boardwalk Island on Poptropica. The crab will be found on the boardwalk at the end of the mission. The crab can be picked up using the helicopter.
find the boy
press on it
Steamworks Island.
the crab on steamworks island is next to the living quarters
You hook the crab with the remote controlled helicopter you get from the little boy.
to catch the crab
jump on it
Jump on it.
then you get gregs money with the crab and give it to him and then you win the game
You jump on it
jump on top of it.
On Poptropica, Steamworks island you are using the robot crab to cool down the bell. Once you have cooled the bell down you can touch it without being burned.