in the oasis, you can get the turritopsis jellyfish for 5gb. you can freeze only adults and adols with this one
in the Slot Machine, which is in the games section in Crossroads, if you get the jackpot, or 3 gold beetles, you can get the jellyfish as one of the prizes to freeze your cubs, mostly used on lethals

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Freeze without losing their ability to breed/king: Do not roll over your account or store it on a side account and do not rollover until your ready. The lions will not age a day, cooldowns will still be the same until you rollover.

V below makes them useless, just a trophy. V

Freeze a cub: Win the Jellyfish gold beetle prize from slots machine in the game area. (cub with coconuts then click on slots.) item is only called 'JELLYFISH' it can be bought from other players in branches/trade center.
Freeze Adol+adult: Go to oasis and buy Turritopsis Jellyfish.

Don't forget to buy a frozen slot by going to your profile where your main male icon is, and look at the stats to: Frozen Slots: (+)

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Can i use the aging crystal on the cub to be adol then freeze it with the normal oasis jellyfish?

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Zuki - yes, you can, but only on mutations that live to adolescent. It wont work on lethals that die in first few months of life. Remember that lions frozen with a jellyfish cannot be unfrozen, they become a trophy lion that cant breed, hunt, or patroll/become king.

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Aha okay .. Deaf lethal will survive if i applied an aging crystal?

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