Crowley's (1995) dictionary of Bislama gives no indication of the relative frequency of the different options. The dictionary also has entries for dog man, dog woman possibly suggesting that this order is slightly more frequent. This would indeed be consistent with what we know is the older variant of N-N compounding, where the head N precedes the modifier, e.g. glas daeva 'diving mask', man Malo 'man/person from Malo island'.
Source: Crowley 1995: 58
Source: Crowley 1995: 143