You can still do blue buff and gromp at the same time on the PBE. I haven't found a 100% consistent stat yet, but I'm sure it exists. This works on red
Blue Buff Gromp Zac Clear : r/thesecretweapon
How the frog becomes the Gromp. - YouTube
Gromp got an OP buff in Season 12 League of legends - YouTube
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League of Legends - Philippines - Gromp Icon now available in store. Get it now! Read more: http://goo.gl/kfCz1h | Facebook
Gromp | League of Legends Wiki | Fandom
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how to kill gromp and blue buff at the same time : r/leagueoflegends
Sion Tip - How to Steal Blue Buff and Gromp at Level 1 - YouTube
Gromp | League of Legends Wiki | Fandom
Monsters | League of Legends Wild Rift Wiki - zilliongamer
A new method i learned to clear Gromp and Blue buff quickly. : r/leagueoflegends
Gromp or blue first when double clearing? : r/FiddlesticksMains