I'll give you a stupid OP rune stupid OP rune setup for poppy that will make you enjoy league in the toplane again.
Inspiration X Domination
Kleptomancy(your passive creates EzPz items for you by Q auto enemy laner)
Delivery biscuts(will get your mana pool up and Kleptomancy can make biscuts that also give you more mana)
Free 10 minute boots(300G above your opponent already? dang. Well good thing you're gonna make a good 400 from klepto alone before laning ends)
+100 health and -10% damage(The 10% damage reduction reduces your Q by basically nothing because a % of a % is insanely small).
Resolve:
Demolish(cause now your enemy laner can't leave lane without losing looooooots of towers)
- Armor + MR at 10 minutes (this just synergizes insanely well with Poppy W passive because both Poppy passive AND this rune stack with each-other.
Build:
If against AD:
Trinity, Steraks, Sunfire, Spirit Visage, Gargoyle Plate, CDR boots.
if against AP:
Spirit visage, Steraks, Gargoyle plate, Death's dance, Maw, Mr/tenacity boots.
This build is hilariously overpowered because it makes poppy a lane bully by virtue of: her q is super spammable, which is what let's you get the easy Q passive-Auto proc on enemy champs for an item.
With this build I've been at full inventory by the time I do a first back(usually around the 8-10 minute mark depending on if I got ganked)
It's the funniest thing when you are at full inventory and you Passive auto someone and it spawns a ward RIGHT in their face.
Not to mention you get insane mana + potion sustain, SAFELY, from behind your minions if you are really low health.
It's probably not much help to Poppy's actual problems as a tank but this setup will serve as a nice distraction.
Hope I could help ease the pain,
MuffledGarbage