The continuous monitoring capability of Fermi-LAT has enabled the exploration
of Quasi-Periodic Oscillations (QPOs) in the γ-ray light curve of blazar
that has given a new perspective to probe these source and jet physics over a
wide range of time scales. We report the presence of transient QPOs in the
long-term γ-ray light curve of blazars PKS 0244-470 \& 4C +38.41. We
first identified different flux states using the Bayesian Block algorithm and
then explored the possible transient QPOs in the segments of each flux phase
where the flux level changes over fairly regular intervals. Combining this with
source intrinsic variance, we identified two flux phases for PKS 0244-470: one
activity (AP-1) and one quiescent phase (QP-1). For 4C+38.41, we similarly
identified four activity (AP-1, AP-2, AP-3, and AP-4) and two quiescent (QP-1
and QP-2) phases. AP-1 phase of PKS 0244-470 shows QPO of ∼ 225 days
persisting for 8 cycles (∼ 4.1 σ). In 4C+38.41, AP-1 and AP-2
phases show QPO of ∼ 110 days and ∼ 60 days, respectively, persisting
for 5 cycles. In AP-3, we identified three sub-phases, and all show a ∼
week scale recurrent rise with five complete cycles, while in QP-1, we could
identify 2 sub-phases (Q1 and Q2). Q1 phase shows a significant period of
∼ 104 days with six complete cycles. Q2 phase also shows significant QPO
but with only ∼ 3.7 cycles. All the detections are locally significant
with at least four or more cycles. We discuss the possible origin and argue
that the current driven kink instability and curved jet model seem the most
likely cause for shorter and longer QPOs though the latter requires continuous
acceleration or injection of particles to explain these