Green’s Dictionary of Slang

freckle n.

(Aus.) the anus.

[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxiv 4/5: freckle: Anus.
B. Humphries in Tharunka 13 June 14/5: I’ll kick his teeth so far down his throat he’ll have to stick his toothbrush up his freckle to clean them.
[Aus]C. Bowles G’DAY 83: W oss the mail on the joker with the leather pants? Looks like a bit of a bumjumper ter me [...] I’ll keep me freckle to the wall.
OnLine Dict. of Playground Sl. [Internet] freckle n. anus (descriptive).

In compounds

freckle-puncher (n.)

a male homosexual.

[Aus]B. Humphries Barry McKenzie [comic strip] in Complete Barry McKenzie (1988) 51: Kevin huh? Sounds like a flamin’ freckle puncher!
[Aus]K. Lette Girls’ Night Out (2010) 76: Playing hide the pork sword with chicks who dodn’t shave under their armpits is bloody terrible. For an awful minute, you think you’ve turned freckle-puncher.
[Aus]B. Moore Lex. of Cadet Lang. 150: freckle puncher an arsehole fucker; a gay; also a non-specific term of abuse.
[Aus]Bug (Aus.) Apr. [Internet] I never saw much sense in the regular pastime for my fellow A grade players of going into town and bashing up freckle-punchers in the public toilets.
B. Barrack Touch Wood [ebook] Off you go to the CBC, young freckle-puncher. Step and fetch for faggos.

In phrases

get freckles on one’s throat (v.)

(US) to feel thirsty.

[US]C. Connors Bowery Life [ebook] If a bundle got freckles in her t'roat—you know, got dry, see—I'd hev coon waiters ter bring her a couple uv tubs uv milk so she could drown de freckles out.