Pacific, $0.05/$0.10 No Limit Hold'em Cash, 5 Players
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Hero (BTN): $10 (100 bb)
SB: $6.83 (68.3 bb)
BB: $20.34 (203.4 bb)
MP: $12.16 (121.6 bb)
CO: $11.63 (116.3 bb)

BB is running 67/0/0 (After only 12 hands though)

Preflop: Hero is BTN with Jh Th
MP folds, CO raises to $0.30, Hero calls $0.30, SB folds, BB calls $0.20

Flop: ($0.95) Jc 5s 7d (3 players)
BB bets $0.47, CO folds, Hero calls $0.47

Turn: ($1.89) 2d (2 players)
BB checks, Hero checks

Feel like when he donks a dry flop and then checks the turn he usually just has air, so I didn't see much value in betting.

River: ($1.89) Ts (2 players)
BB bets $0.94, Hero raises to $3.50, BB raises to $19.57 and is all-in

I figured this hand is a monster vs. someone this fishy so I raised for value. Also in the previous hand he shoved river vs. me where I ended up folding. I don't see what sets he could have that donk flop and check turn. Is this just an easy fold vs. a passive fish?