In 2020, the cooling-induced thermogelation of an ABA-type triblock copolymer system comprised of hydrophilic poly(2-methyl-2-oxazoline) (pMeOx) A blocks and a hydrophobic poly(2-phenyl-2-oxazine) (pPheOzi) B block was described. Unexpectedly, the sol-gel transition of this polymer was also found to be accompanied by a transition in polymer self-assembly from spherical to worm-like micelles. The resulting gels could be tuned markedly with regard to their stiffness by varying the concentration, allowing for both rather soft materials at a polymer concentration of 5 wt.-% (storage modulus G' ≈ 100 Pa) and very stiff hydrogels at 40 wt.-% (G' ≈ 100 kPa). Importantly, replacement of the hydrophobic PheOzi moieties by slightly different aromatic repeating units, namely 2-phenyl-2oxazoline (PheOx) or 2-benzyl-2-oxazine (BenzOzi), did not yield a similar order-order transition -and hence did not result in thermogelation upon cooling. In contrast, slight variations of the hydrophilic moieties using poly(2-ethyl-2-oxazoline) (pEtOx) or poly(2-methyl-2-oxazine) (pMeOzi) outer blocks still enabled the formation of worm-like aggregates upon cooling, but reduced gel strength and gelation kinetics. Thus, the PheOzi-moieties appear to be the decisive driving force for the unusual cooling-induced thermogelation of these ABA-type triblock copolymers. However, the impact of the arrangement of hydrophilic and hydrophobic moieties has yet to be considered in the context of the pPheOzi-based copolymer systems.