Teemo vs Trundle Top Matchup

Why Teemo is favored

Teemo's ranged poison and blind disrupt the extended attack trades Trundle needs to win duels, so Trundle players advise waiting for Blinding Dart(Q) to be spent or arranging a gank. Teemo must still disengage when Trundle uses Subjugate(R), since Trundle can run him down if he reaches him after level 6.

How to play as Teemo

Pressure Trundle while he farms and keep mushrooms between you and his approach; if he uses Subjugate (R), kite away until the steal wears off instead of trading through it.

Subjugate (R) steals Teemo's health and resistances over time, while Noxious Trap (R) creates a slow zone that can help Teemo disengage when Trundle commits to an all-in.

Trundle relies heavily on basic attacks for his trades, while Teemo's Blinding Dart(Q) can deny those attacks and Toxic Shot(E) adds damage to Teemo's ranged attacks.

How to play as Trundle

Don't force an all-in while Teemo still has Blinding Dart(Q); look for a gank or wait until he spends it on a minion, then use Frozen Domain(W) and Pillar of Ice(E) to stick to him. Avoid chasing through Noxious Trap(R) slow zones while your Subjugate(R) is down.

Sources

These notes come from r/TeemoTalk and r/Trundlemains, checked against the champions' abilities.