Hard to really see how that's possible since Led's formation precedes Humble Pie by at least five months. Even harder to see since Zeppelin was primarily a blues influenced band in the beginning, and their later work shows no influence from Humble Pie, nor, to my knowledge have any band members ever claimed that any ever existed...
Humble Pie was a spinoff from The Small Faces (of Itchycoo Park fame). I think Frampton was with them for the first few albums before he went solo.
Should have said Marriott since Page said he was the benchmark for a singer. Marriott was with Small Faces in the 60s.