, ▁reduced , ▁or ▁even ▁absent ▁in ▁certain ▁spec im ens . ▁The ▁white ▁or ▁cre am - color ed ▁unders ide ▁or ▁vent ral ▁side ▁of ▁the ▁f rog ▁typically ▁has ▁dark , ▁scattered ▁fle cks . ▁A ▁single ▁white ▁stri pe ▁runs ▁along ▁the ▁upper ▁lip , ▁and ▁a ▁heavy ▁dark ▁stri pe ▁runs ▁across ▁the ▁eye ▁and ▁along ▁each ▁side ▁from ▁the ▁sn out ▁to ▁the ▁leg . ▁A ▁dark ▁tri angular ▁spot ▁on ▁the ▁head ▁may ▁also ▁be ▁seen ▁in ▁some ▁individuals . ▁These ▁fro gs ▁have ▁small , ▁round ▁to es ▁without ▁p ads ▁and ▁very ▁little ▁we bb ing ▁between ▁each ▁toe . ▁ ▁Typ ically , ▁males ▁are ▁smaller ▁than ▁females , ▁and ▁can ▁be ▁told ▁apart ▁from ▁the ▁females ▁by ▁their ▁yellow ▁vocal ▁sac s ▁when ▁calling . ▁When ▁not ▁calling , ▁this ▁sac ▁looks ▁like ▁a ▁dark , ▁loose ▁f lap ▁of ▁skin ▁beneath ▁the ▁thro at . ▁ ▁T ad pol es ▁of ▁the ▁western ▁ch orus ▁f rog ▁have ▁gray ▁or ▁brown ▁bodies . ▁Their ▁body ▁shape ▁is ▁round ▁with ▁clear ▁tail ▁fins ▁and ▁dark ▁fle cks . ▁The ▁int est inal ▁co il ▁reported ly ▁can ▁be ▁seen ▁through ▁the ▁bel ly ▁skin ▁if ▁closely ▁observed . ▁Their ▁lips ▁are ▁black . ▁ ▁Tax onomy ▁ ▁P . ▁tr iser i ata ▁was ▁once ▁considered ▁a ▁sub species ▁of ▁the ▁southern ▁ch orus ▁f rog , ▁P . ▁n ig rita , ▁but ▁was ▁rec lass ified ▁as ▁its ▁own ▁species