Hey, do you know which pedal Jonny is using to make his telecaster sound like a bass guitar on Bloom live at Macareta?

Since 2011, Jonny has used a Digitech Whammy WH4 for all pitch-shifting duties (prior to that, he used a Whammy WH1). For Bloom at Macerata, he used its 1-Octave Down pitch-shift mode. 

You can see Jonny’s Digitech Whammy WH4 in this screenshot from the band’s performance of Separator at the Best Kept Secret Festival, 2017.06.18 (radiohead.tv).