Mick Weaver - a.k.a. Wynder K. Frog:

Keyboardist, appearing on lots of albums by fringe-of-the-blues-musicians of this period:
Miller Anderson, The Grease Band, Juicy Lucy, The Butts Band, Keef Hartley, Eric Burdon...
Also appeared in constellation of Mason, Wood, Capaldi & Frog, i.e. Dave Mason, Chris Wood and Jim Capaldi, all ex-Traffic.
The instrumental Wynder K. Frog albums were recorded in the solid company of Dick Heckstall-Smith, Neil Hubbard, Chris Mercer, Alan Spenner... 
"Music just cannot swing and groove any more than this. It is pure, vintage soul/jazz, in particular the Bobby Timmons tune, "This Here". Wynder himself leads the band on organ, and the l.p. includes some hot versions (of) "Jumping Jack Flash", "Green Door", and "The House That Jack Built".
ISLAND' s presentation of Wynder K. Frog's "Out Of The Frying Pan" album in "The Record Buyer", Febr. '69.

Albums in the Frog's name:
"Sunshine Super Frog" ISLAND ILPS 944
"Out Of The Frying Pan" ISLAND ILPS 9082
"Into The Fire" UA 6749 (U.S. issue)

Links:
The Musicians' Olympus: excellent Mick Weaver page!