The "frog" was a EB0 that Dennis put a P bass pickup in along with the mudbucker. I would love to do a frog tribute but these days I hate hacking up vintage stuff...................even something as common as a EB0.
I like the bass sounds Dennis gets out of the frog on love it to death, good songs there too.
P and mud is a far better combination than J/mud, which is quite common. I tried lots of bridge pups on the eb3,
some works OK but I guess it's too close to the bridge.
Hack up some P's instead, I love the stuff Rick Laird plays with the Mahavishnu orchestra, sunburst P with mud at the neck