QTo

I'd say that no decision seen in isolation is that bad, but they add up to playing for half a stack with a shit-hand. It is the fish that should play for 50 bb with TPNK.

But look at this board structure.
There are just to many draws to fold this hand. Just name it : every possible FD - means 60 combos, every possible OESD = 16 combos of 76, 16 combos of 32 and for sure many forse Qx.

Stabbing turn might be okay but I guess OTR you are too often behind. There are some 44, 5x, Ax and better Qx. Villain looks very passive at least pre flop and his line is strong. He might also realize that betting 20bb to 80bb doesn't generate too many folds.

I wouldn´t call this PF. As played I guess we can bet the turn, as villain is a fish. But I´m not sure OTR, it´s small bet, if it was at least 1/2 of the pot I would fold, but can we fold to 1/4 of the pot?

PF is not ok for me too. Stabbing turn is ok.

You should actually be worried on the flop already. The SB (who isn't a confirmed nut bag) bets knowing the fish will call. Though he got out of the way this time, he is a solid favorite over your TPNK on average once he bets flop, and you are in a squeeze between him and the fish. Not good prospects. Like I said, I don't hate any of the plays in OP, but they add up to something that fish should be doing; investing a lot with small hands.

It all looks marginal. Preflop call is probably fine, but we might be rather folding because will probably be in a multi-way pot with a dominated hand without position. Maybe we could bet the turn smaller, to set ourselves worse pot odds to call the river if SB shoves. I would then check/fold (almost any) river if BTN stays in the hand.

I definitely don't like that pre-flop call.