need help with sexing my pixie frog please

[Sublime]

well i bought it from lll reptiles maybe a month ago and it was pretty small like quarter size and my g/f has heard one of the frogs croaking in the living room ive yet to here it and she couldnt tell wich tank it came from so.... idk it grew really quick i couldnt beleive it eats real well has yellow in the armpit area

Yellow in the armpit is not an indicator. Feeding behavior, growth pattern, and head size all are. Some people will give you other indicators that either can't be proven or are false.

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