Yes, if you are a member!
The 3rd secret moshling on moshi monsters is Blingo the Flashy Fox.
If you have purchased a specific item to get a code for a special moshling seed, you enter that code on the "Sign In" page on Moshi Monsters, in the third box that says "Secret code (optional)".
no one has ever got the third secret moshling so no one knows
At this time there is no information available about a Moshling called Jumbo.The 3rd secret Moshling is Blingothe Flashy Fox.
There are several ways to get Moshlings on Moshi Monsters. One way is to buy seeds and plant them in your Moshling Garden. Different combinations of seeds and flower colors may attract a Moshling to your Moshling Garden. The Cluekoo in the Moshling Garden will help you figure out the correct combination to attract a Moshling. Another way is to buy a specific item that includes a code for a specific seed which, when planted with any two other seeds, will attract a specific Moshling to your Moshling Garden. The third way is available only to paid Moshi Members. Moshi Members become Super Moshis and complete Super Moshi Missions. A Moshling helps the Super Moshi in the mission and becomes a part of the Super Moshi's Moshling Zoo at the end of the Mission.
Plinky
No it is not possible to steal or even give away Moshlings. Once Moshlings are in your Moshling Zoo, they stay there. Note for free Basic members: You may only have two moshlings in your room. When you attract a third moshling, you will be asked to choose which one to let go.
003 Gingersnap the Whinger Cat [Kitties] any Magic Beans, any Love Berries, any Hot Silly Pepper
The third Super Moshi mission should be available. Be sure you have completed the first two missions and are a paid Moshi Monsters member.
Type in ALLMOSHLINGS (in capital letters).Type in the code correctly with no mistakes in the box third from above on the 'Moshi Monsters - Sign In' page, where it says "If you have a secret code, you can enter it here: " When you reach your house, open up the inventory to find a special item.
If you are a free basic member then you will be able to keep 2 Moshlings. When you attract a third, you'll be given the option to set one free. If you are a paid Moshi Member then you will be able to keep 6 Moshlings in your room but you also have access to the Moshling Zoo. If you are a paid member, you keep all the moshlings you attract, either in your room or in the Moshling Zoo.
Type in the code correctly with no mistakes in the box third from above on the 'Moshi Monsters - Sign In' page, where it says "If you have a secret code, you can enter it here: " When you reach your house, open up the inventory/treasure chest to find a special item.