Jediswap
https://app.testnet.jediswap.xyz/#/swap
Jediswap does not support the playground tokens so we need to do some additional things before swapping.
Step 1:
First we add their specific tokens into our Argent X wallet first.

J26JAN0 address: 0x178dbb224d42b76d1e4697741c8c43068ced9792bc511941ce865c0fc951369
J26JAN1 address: 0x41e1b41f88e7c8390c0d23f927b37dd69e2e8fec21f52631e04b210a71c0fe4
J26JAN0 address: 0x496585a4cbaf2d7475b1f5294b83e7fea343ff3fe7c7625b87ea46c6f83eb1d
This is what you will see afterwards:

Step 2:
Now we mint the tokens using the block explorer.
To mint J26JAN0, go to https://goerli.voyager.online/contract/0x0178dbb224d42b76d1e4697741c8c43068ced9792bc511941ce865c0fc951369#writeContract and connect your Argent X wallet.
(You might have to refresh once to get it to detect your wallet.)

At “6.mint”, enter the following,
recipient: Your Argent X wallet address (0x…)
amount.low: 1000000000000000000000
amount.high: 0
Click “Transact” to mint your tokens.

You will see 1000 $J26JAN0 in your Argent X wallet afterwards.

If you want to mint $J26JAN1 and $J26JAN2, repeat the above with the links below. (You can swap using $J26JAN0 already so this is optional.)
Step 3:
Finally we are ready to make some swaps. Go to https://app.testnet.jediswap.xyz/#/swap and connect your wallet.
We just minted $JAN26J0 so we swap it for $JAN26JAN1.

Swap multiple times between the 3 tokens and that’s it. Other functions like adding liquidity are not usable yet.