Hello and welcome to FF Eddie! Find sex my Pixie threads interesting because they sometimes have disagreement not only on the sex but on the species .

Well, your frog is not P. adspersus (guess everybody agrees on that so far) so it was mislabeled by seller. Thanks for your good pictures and do have a question; how long is your frog from snout to vent (SVL). Reason I'm asking is, because pics matches well a male frog Vosjoli mentions in his book as a Pyxicephalus sp. "dwarf" to differentiate from P. edulis. They look close to a P. edulis but males have a distinct bright yellow throat. This is a smaller frog with females reaching 3.5 in. and males around an in. more (hence me asking frogs size).

If your frog is bigger than that, then it's probably P. angusticeps. Do not recommend forcing mouth open to verify. SCF suggestion to wait until next shed is good. Maybe get lucky with flashlight or camera flash and get to see them. Your frog is a nice specimen and looks very healthy, congrats !