A spin on the "age" of dragons concept, here are some homebrew small Krakens. CRs 2 and 5.
KRAKENLING
Medium monstrosity, chaotic evil
Armor Class 15
Hit Points 59 (9d10+9)
Speed 20ft., swim 60ft.
STR 17 (+3)
DEX 11 (+0)
CON 13 (+1)
INT 14 (+2)
WIS 10 (+0)
CHA 14 (+2)
Skills Athletics +7...