On the river, he's offering you 2.83:1, so you need to be best ~26% of the time for this to be a profitable call. There are pretty much no draws he could be bluffing with, so basically you're hoping he has 88-JJ, maybe 55 or 66. So it's probably pretty close, just because it's 2NL I might lean towards a call.
As for bet-folding the turn, I'm not sure how great of an option that is, villain has $1.25 left and there's $1.35 in the pot... I guess we could bet smaller to allow ourselves to get away should he raise, but even if we bet half the pot, ~$0.70, we'd only have to call $0.55 into a pot of $3.30, which is 6:1 odds
, so we'd have to be better ~16% of the time for it to be profitable... I guess you might not good that often, but again it's pretty close.