Up to "F"...
The original firdrake is pure monsterbloat. A little red dragon for a game that has baby red dragons and fire lizards already. So making it any kind of lizard is off the table. And taking the "drake" part literally and making it a kind of kind of duck is better left to DMs gonzo-er than I. I figure "firedrake" is a decent Vancian name for a mysterious fiery entity. The spark crawled and spun, pooling and pulling shapes from itself until it wore the familiar grin and curled talon of a firedrake...
So: if you cast a fireball and roll all 1's for damage, it becomes a firedrake, which is a mischievous sort of fire elemental that attacks the nearest flammable thing then jumps to the next flammable thing and the next and the next for a half an hour before fading out of existence...

Firenewts are exactly like lizardmen but they breath fire. Which is really a great trick since it makes both lizardmen and dragons less unique and fun. This firenewt...

More blatant firebloat: firesnake and firetoad. For every scary thing in D&D there is a snake version of that thing and, on a 4-6, a toad version of that thing. There is little I can do with the word, concept, or picture of "firesnake" or "firetoad" to make them not just what they are. Here's my best shot...


In majestic contrast to all this fire_____ bullshit, the flail snail is a perfect and unimprovable monster.


So anyway fuck the Flind. Way ahead of even "booka" and "bunyip" in competition for most malphonic word in the folio. Sounds like you're vomiting with a lisp. Flind. And so bloaty: a gnoll, only a little bigger and with a chainy weapon that would reappear in Oriental Adventures. So, the makeover: they are guignolls and they are alchemically-fucked up gnoll berserkers with prosthetic body parts. Exhibit A here has a chain with a guy's head on the end instead of an arm but each guignoll is unique. The rest of the gnolls treat these guys as sacred gladiators.



The Forlarren is unusual in being a tragic monster with a fairly compelling behavioral schtick: it longs to kill the PC and then feels just terrible about it once it succeeds. It has a kind of generic (but stylishly realized) Russ Nicholson bad-Puck picture, which can be fixed up by taking the redundant satyr-derived design elements out of it...

At the end of "F" we got the frost man. Which is an eyepatchy kind of guy who can shoot a cone of frost from said patched void and who, in common with most cave-dwelling species, has extraordinarily poor taste in clothing. Anyway, I believe a writer far better than whoever invented the frost man (this guy?) could probably write a creepy short story where an entire race of men who all have eyepatches (but why do they...oh never mind...) and who shoot cones of frost from these desolate sockets and do creepy icy things or at least do a few things that don't just remind you of pirates and frosty cones and a million other things you'd rather think about than dumb eyepatch cavemen. I am not, tonight, that man. Today I am the man that drew a picture while trying to draw something else entirely of this guy...

______
*Yes I see your pun and have chosen to ignore it.