Times Cryptic Jumbo 1470

[NeilMunro]

Very grateful for all help with these clues please.
20dn: “American character with endless penchant for frogs and things (8).”
26ac: “A girl has ways to replace last of these old quibblers (8).”
32ac: “Killer serving sentence - keeping busy? Not at first (11).”
40ac: “Traps detective swigging the hard stuff (5).”
41dn: “Overcome by amphetamine, heartlessly drive fast car (9).”

[aelmpvw]

20d amphibia

[aelmpvw]

26a sophists

[Lie-in King]

20d Amphibia - 'Am(erican) phi (character) bia(s; endless)'
26a Sophists - 'Sophie' with 'st(reet)s' for '(thes)e' (last of)
32a Insecticide - 'inside' (serving sentence, keeping) '(h)ectic'
40a Drums - 'DS' (detective, swigging) 'rum'
41d Speedster - 'speed' (amphetamine) + 'st(e)er' (heartlessly)

[aelmpvw]

32a insecticide

[NeilMunro]

Many thanks!