I'll do my best with the names! Some background though: there are no particularly mountainous regions in traditionally Russophone areas, and thus no native Russian mountain names for comparable terrain. Modern Russia has such terrain, but the names are largely taken from the names used in the local/indigenous languages, not Russian. Another thing is that Russians don't tend to come up with descriptive names like the Celtic and Germanic cultures did, instead places are named for people and folklore if no native name is available. If your Russia-expy culture is anything like historical Russian people, that might be something worth considering. But the immediate relevance of this is that there's no reference material for me to look at, so the names I'll suggest to you are my attempt at descriptive naming in Russian.

Also, where two similar Russian words are separated by a slash, the first is singular, the second is plural.

Slomannoy: "Slommanoy" implies something is simply broken or cleft, "Lomannoy" implies breaking that was continuous in the past, and so has a more "shattered" connotation.
Lomannye Gory (Broken Mountains, plural)
Lomannaya Gora (singular)
Lomanny Greben' (Broken Ridge).
Knife-related names are a bit tricky, Russians don't think like that. Knives in Russian don't have points (tochka/tochki), they have ends (konets/kontsy), but this doesn't have the connotation that it does in English, and I can't imagine the phrase being used for toponymy. Russians also don't generally think of any land feature as "serrated", that description only applies to small features. More native-sounding alternatives:
Ostrye Gory/Piki (sharp mountains/peaks, plural)
Ostraya Gora/Pika (singular)
Ostry Greben' (Sharp Ridge)
Rezak/Rezaki (cutter, can also mean slaughterer, I can vaguely imagine this being used as a colloquial name for a high, sharp peak)
Rezanye Gory (mountains that have been cut)
Rezany Greben' (cut/carved ridge)
Neborez (sky-cutter, could also be called "Gora Neborez", Mount Sky-cutter; these are a bit more poetic, but no stranger than descriptive names would be)
If you're particularly set on knives, you could name a whole ridge/range "Nozhy" (knives) or "Greben' Nozhov" (ridge of knives), and give individual peaks names like "Bol'shoy Nozh" (big knife), "Maly Nozh" (small knife), Stary Nozh (old knife, for a particularly bulky-looking one perhaps), Cherny Nozh (black knife, for a dark moutain), and perhaps more folklore-ish names like "Nozh Dyavola" (Devil's Knife).

Sammit Burya: This one as-is means "The summit which is called 'Burya'", probably not what you're looking for. "Sammit" is a relatively recent loanword as far as I know, so I would avoid it (and "Pik" and "Pika" as well) if you're going for a Russian feel. Older/Slavic-based words would be Vershina (summit, peak), Verkh (top), Verkhushka (top point). Also, "burya" refers to windstorms (including snowstorms). For thunderstorms, then the word to use is "groza" (which can also have a connotation of "threat" and "fright" in some of its forms). I will provide versions including both "burya" and "groza" so you can decide which is more appropriate.
Bureva Vershina (peak of the windstorm, with the storm implied to be personified)
Vershina Buri (peak of the windstorm, the storm is not personified, but is implied to be continuous or at least frequent enough to be considered the 'same' storm)
Vershina Bur' (peak of windstorms, not necessarily personified)
Grozny Verkh or Groznaya Vershina (storming/threatening peak)
Vershina Groz (peak of thunderstorms/threats, not personified)

Adskaya Gora is fine. Alternatives in case you're interested: Dyavol'skaya Gora (Devil's/Devilish Mountain), Gora Demona (Mountain of the Demon), Gora Cherta (Mountain of the Demon, using a more native word, though a "chert" is typically seen as a weaker creature), Proklyataya Gora (Damned Mountain)

I hope these help! Do you want any help with the lakes?


My complaint about the cryptocreatures wasn't their presense/plausibility, but the way you drew them. The colours and (to a much lesser degree) the line style clash with the rest of the map.