In Surprised by Joy by C S Lewis again he writes of how in his childhood fictional world Boxen there was an office
held at that time by a man - or to speak more accurately, a Frog - of powerful personality. Lord Big brought to his task one rather unfair advantage; he had been the tutor of the two young kings and continued to hold over them a quasi-parental authority. Their spasmodic efforts to break his yoke were, unhappily, more directed to the evasion of his inquiry into their private pleasures than to any serious political end. As a result Lord Big, immense in size, resonant of voice, chivalrous (he was the hero of innumerable duels), stormy, eloquent, and impulsive, almost was the state. The reader will divine a certain resemblance between the life of the two kings under Lord Big and our own life under our father. He will be right. But Big was not, in origin, simply our father first batrachised and then caricatured in some directions and glorified in others.
Batrachised means to make into a frog!