Let's Go To Gamma World. Meet... The Gatorr.

Gatorr  ("Green Hisser")

No. Enc.:  1d2
Alignment:  Neutral
Movement:  90' (30')
      —Swim:  120' (40')
Armor Class:  4
Hit Dice:  5
Attacks:  2 or 2 (1 bite, 1 tailslap, or 2 tentacles)
Damage:  1d8 / 1d10, or Paralysis (see below)
Save:  L3
Morale:  9
Hoard Class:  None
XP:  500

One of the most common swampland denizens in the Wasted State Of Wrexus, gatorrs are 3'-6' long, ornery crocodilians with pairs of 3' long tentacles jutting from their foreheads. These tentacles Paralyze [per p. 58 of the Mutant Future Core Rules] on contact (as if from a Mental Attack from a WIL score of 10+1d8), and they can strike 2 different targets per round.

Though solitary by nature, gatorrs congregate in groups of 10d6 in the springtime to spawn.

Mutations:  Aberrant Form ("Paralytic Tentacles"), Reflective Epidermis (Radiation)

Not-The-Designer's Notes:  The Gator (one R) first appeared in the 2nd edition of Gamma World from 1983, by James M. Ward, Gary Jaquet, and David James Ritchie.  Original illustration by Larry Elmore.

Not-The-Designer's Notes Addendum:  I had to stat these guys up, because my...shall we say, "ambitious"...13-year-old player decided to blow all his loot on "a really cool pet", and, well, he picked a mutant alligator sold by a sketchy meat vendor in a particularly scummy side of Gunspoint.

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This is NOT gonna end well.