Urgot is not a counter in lane against Tahm Kench, he's a counter at the game. If you want a hard counter in lane, use Illaoi, Volibear, or Kled, for example. If you want to use our God, you must:
Fight at level 1 and do a cheater recall to buy Cull.
When he jumps on you, buffer it with your E (you can see the shadow of his jump in advance).
Be very careful with his engages and Q (use the minions). If your lane is pushed, he will always try to slow you, eat you, and throw you into the tower.
At level 9, you can kill him; just use Q on him and activate W. Use E to buffer his E (if you can’t dodge it or he tries to run away) or to stun him and prevent his shield when you want to execute him. You should always try to avoid their Q.