I 3-bet with T8s and hit top pair, i bet flop and opponent minraises, i call it.
He checks Turn !!

On River he suddenly overbetshove but this looks bluffy in my eyes, why he wasnt betting the turn and ithere is a possible str8 but he shouldnt have the str8 with this liine.

This is why i called, not sure if im resultorientated here.

888 Poker - $0.30 NL (6 max) FAST - Holdem - 6 players
Hand converted by PokerTracker 4

Hero (BTN): 101 BB
SB: 144.6 BB (VPIP: 24.83, PFR: 5.37, 3Bet Preflop: 0.00, Hands: 151)
BB: 93.4 BB (VPIP: 22.22, PFR: 16.67, 3Bet Preflop: 33.33, Hands: 18)
UTG: 70.9 BB (VPIP: 33.33, PFR: 33.33, 3Bet Preflop: 100.00, Hands: 7)
MP: 40 BB (VPIP: 12.50, PFR: 12.50, 3Bet Preflop: 0.00, Hands: 16)
CO: 107.17 BB (VPIP: 29.38, PFR: 26.29, 3Bet Preflop: 3.33, Hands: 199)

SB posts SB 0.5 BB, BB posts BB 1 BB

Pre Flop: (pot: 1.5 BB) Hero has T 8

fold, fold, CO raises to 3 BB, Hero raises to 9 BB, fold, fold, CO calls 6 BB

Flop: (19.5 BB, 2 players) 3 4 T
CO checks, Hero bets 9.73 BB, CO raises to 19.47 BB, Hero calls 9.73 BB

Turn: (58.43 BB, 2 players) 7
CO checks, Hero checks

River: (58.43 BB, 2 players) 5
CO bets 78.7 BB and is all-in, Hero calls 72.53 BB and is all-in

When ever you have a weird, non-standard spot, it typically comes down to player reads.
So it's really hard to give an answer here. Knowing your villain is the key.
If you want a "GTO-solution": He's repping narrow (65s 76s) + sets which he might not jam, if you think he can have random spew then you can consider calling. T8s is okayish call as it blocks top set, but it's purely a bluff catcher. AT and T8s would prob play the same in this spot.

+1

I feel that on the flop your V might be doing this w/ 66 - JJ or a better T. 56s is also a possibility (assuming he doesn't call 56o pre vs a 3B) but that's obviously not very likely.

River is very confusing indeed but I don't think calling here is great without more info on V.

I don't 3bet this preflop
flop I'd bet like 2/3
maybe 1/2 to 2/3 on turn
then check and evaluate river