You can get a random moshling on Moshi Monsters if you plant any three seeds on Moshi Monsters. However, you may not get a moshling at all if you have not planted a combinations of seeds which will attract a moshling.
There are no Chop Chop seeds on Moshi Monsters. To get Chop Chop the Moshling on Moshi Monsters, you plant three Dragon Fruit seeds in your Moshling Garden. To get to your Moshling Garden, look at the lower left corner of your Moshi Monster's room. Click on the sign that says "GARDEN".