frog, dire (“killer frog”) (Monster Manual)
Small Animal (aquatic)
Hit Dice: 1d8+4 (8 hp)
Initiative: +1 (Dex)
Speed: 15 ft., swim 20 ft
AC: 13 (+1 size, +1 Dex, +1 natural)
Attacks: Bite +1 melee; claws –1 melee
Damage: Bite 1d4+1; claws 1d3
Face/Reach: 5 ft by 5 ft. / 5 ft.
Special Attacks: Jump
Saves: Fort +6, Ref +3, Will +1
Abilities: Str 13, Dex 12, Con 19, Int 2, Wis 13, Chr 6
Skills: Hide +9*, Jump +20, Listen +7, Move Silently +5, Spot +7
Feats: Multiattack
Climate/Terrain: Temperate and warm swamp or aquatic
Organization: Solitary, clutch (2-5), or swarm (7-18)
CR: 1/3
Treasure: None
Alignment: Always neutral 
Advancement: 2-4 HD (Small); 5-6 HD (Medium-size)
These extremely aggressive aquatic predators are typically 2-3 feet long. They lie mostly submerged in rivers or marshes, with only their eyes showing, waiting for prey to come within reach of their leaping attacks. 
Combat
Jump (Ex): Killer frogs can make spectacular leaping bites as part of an attack action (they can jump and then take full attacks, or move and then still jump and bite). If a killer frog attacks in the same round that it jumps, figure its bite as a charge attack. 
Skills: Frogs have a +15 racial bonus to Jump and are not limited to the usual maximum jumping distances by height. *Due to its coloration, a killer frog has a +4 racial bonus to Hide in weedy, marsh-like surroundings. This bonus improves to +12 when the frog is submerged in water.