Teemo is garbage, literally.
Please, I beg you, don't even consider picking Teemo because you are leaving your team 4v5, that champion is a garbage bag that can't do anything.
As a Jungler, I really don't appreciate listening to your endless and desperate pings for help when enemy is literally raping you with cactus cleaving your butt hole apart, shitting in your muzzle, skinning you alive and don't even spending money on boots because he can make them of of your fur for free.
And you know what? If enemy Ekko is 6-1-0 because he clubbed you so hard and made you standing in grave with 1 foot, I can't really help you since you won't be able to contribute anyhow and I'll probably end dying.