Apparently Frog and (be)hemoth isn’t a creature unless the nice Wizards of the Coast give permission.
Sigh. So, I present my take on a classic favorite. This is the Sharkhemoth. It’s preferred method of digesting its prey is to slam them into its giant, tooth-filled maw.
Picture, if you will, an enormous bipedal hammerhead shark with four large sucker covered tentacles sticking out of its face. It has a gigantic maw filled with rows of razor sharp teeth. For added intensity, there are sharp, blade like projections running down the center of its back.
Sharkhemoth: Init +2; Atk bite +5 melee (1d10+3) + Swallow (see below), Tentacle +3 melee (1d8+3) + grab; AC 15; HD 6d8+2; hp 25; MV 30’ Swim 40′; Act 4d20; SP Grab, Swallow whole; SV Fort +5, Ref +3, Will +1; AL C.
If the attack roll for the bite is 4 or more greater than the number required (or a Critical Hit), they can swallow creatures (man-size or smaller) whole; swallowed victims take 3d6 points of damage each round thereafter.
Tentacle attacks: If one tentacle hits, do damage as normal (1d8+3,) If two tentacles hit the same target, the target must make a Ref Save DC 12 or be grabbed. Grabbed targets with two tentacles reduce their action dice by one step. If three tentacles hit the same target, the target must make a Ref Save DC 14 or be grabbed. Grabbed targets with three tentacles reduce their action dice by two steps. If all four tentacles hit the same target, the target must make a Ref Save DC 16 or be grabbed. Grabbed targets with four tentacles reduce their action dice by three steps. Once grabbed, the target may make a STR check equal to the DC of the Ref save used to make the initial attack (2 = DC 12, 3= DC 14, 4= DC 16.) to break free. Breaking free of the tentacles may only be attempted once per turn one of the character’s actions.
If grabbed by all four tentacles, the Sharkhemoth automatically receives a fifth attack as a free action to attempt to bite/swallow anyone in its tentacles.