This creature looks like a normal frog, with moist, mottled, blackish-green skin, but grown to truly monstrous size.
Giant Frog CR 1
N Medium Animal
Init +1; Senses low-light vision, scent; Perception +3
AC 12, touch 11, flat-footed 11 (+1 Dex, +1 natural)
hp 15 (2d8+6)
Fort +6, Ref +6, Will –1
Speed 30 ft., swim 30 ft.
Melee bite +3 (1d6+2 plus grab) or tongue +3 touch (grab)
Space 5 ft.; Reach 5 ft. (15 ft. with tongue)
Special Attacks pull (tongue, 5 feet), swallow whole (1d4 bludgeoning damage, AC 10, 1 hp), tongue
Str 15, Dex 13, Con 16, Int 1, Wis 8, Cha 6
Base Atk +1; CMB +3 (+7 grapple); CMD 14 (18 vs. trip)
Feats Lightning Reflexes
Skills Acrobatics +9 (+13 jumping), Perception +3, Stealth +5, Swim +10; Racial Modifiers +4 Acrobatics (+8 jumping), +4 Stealth
Environment temperate or warm marshes and aquatic
Organization solitary, pair, or army (3–8)
Tongue (Ex) A giant frog's tongue is a primary attack with reach equal to three times the frog's normal reach (15 feet for a Medium giant frog). A giant frog's tongue deals no damage on a hit, but can be used to grab. A giant frog does not gain the grappled condition while using its tongue in this manner.
Giant frogs have razor-sharp teeth lining their mouths. They are 6 feet long and weigh 200 pounds.
Starting Statistics: Size Medium; Speed 30 ft., swim 30 ft.; AC +1 natural armor; Attack bite (1d6); Ability Scores Str 15, Dex 13, Con 16, Int 1, Wis 9, Cha 6; Special Qualities low-light vision, scent, tongue, pull.
4th–Level Adv.: Ability Scores Str +2, Dex +2; Special Qualities swallow whole.