Is this foldable on river?

The turn is a bit of a scare card, but I'd just shove on the turn. You don't have enough left in your stack for another effective bet on the river. You want to make them pay for chasing their draws.

the turn is a hell of a scare card. this is a mandatory check, considering the number of players involved in the hand. that said, i would have checked the flop already.

regarding your question on the size :

plan the size in advance.

you have created that unfavorable situation. on the river you should have at least a 50%-70% pot sized bet left in your stack. so you should either bet smaller on flop and turn, or as played ship the turn as ramble already pointed out.

thank you both

I recommend to use a handconverter like weaktight next time. Than is your hand easier to read:
$0.01/$0.02 No Limit Holdem
PokerStars
8 Players
Hand Conversion Powered by WeakTight Poker Hand History Converter

Stacks:
UTG Azon564 ($2.16) 108bb
UTG+1 Hero ($2) 100bb
MP1 Beta987 ($0.95) 48bb
MP2 alexch7373 ($1.50) 75bb
CO Teufelche243 ($2.75) 138bb
BTN bigcjmitch ($2.19) 110bb
SB pegnal540 ($2.21) 111bb
BB akim49232 ($2.16) 108bb

Pre-Flop: (0.03, 8 players) Hero is UTG+1 K♣: K♠:
1 fold, Hero raises to $0.08, 1 fold, alexch7373 calls $0.08, Teufelche243 calls $0.08, 1 fold, pegnal540 calls $0.07, 1 fold

Flop: 5♣: 6♣: J♥: ($0.34, 4 players)
pegnal540 checks, Hero bets $0.22, alexch7373 calls $0.22, Teufelche243 calls $0.22, pegnal540 folds

Turn: 4♥: ($1, 3)
Hero bets $0.70, alexch7373 calls $0.70, Teufelche243 folds

River: A♦: ($2.40, 2)
Hero checks, alexch7373 goes all-in $0.50, Hero calls $0.50

Final Pot:

You can improve your bet sizing for sure. You can even consider to Cbet flop even more like at least 30c and shove the turn. Especially on NL2 you can use larger sizings than normal. Especially multi way.

Cheers,
SDK1987

I would be check/calling flop there or just betting smaller. Problem with big bet is that board will change a lot on turn. If you bet big then you have mandatory check on turn and I would probably check/calll - however in your case after big flop bet you should just shove over his bet on turn as you cant call and fold river to 20% bet.

I think the hand is played fine, its 2nl, tons of fish to bet for value on flop and turn. The river you cant fold getting about 5:1. Villain’s could have called flop with all sorts of stuff, medium PP, FD, Jx ,87, all sorts of stuff, I would be continuing to bet for value on the turn. I think one of the biggest strategies to use at lowest stakes is to bet for value until you get raised. In this case you were slow played against, it happens. Take a note on villain, really bad board to slowplay Jacks on.