In this paper, we first study the skew cyclic codes of length $ p^s $ over $ R_3 = \mathbb{F}_{p^m}+u\mathbb{F}_{p^m}+u^2\mathbb{F}_{p^m}, $ where $ p $ is a prime number and $ u^3 = 0. $ Then we characterize the algebraic structure of $ \mathbb{F}_{p^{m}}\mathbb{F}_{p^{m}}[u^2] $-additive skew cyclic codes of length $ 2p^s. $ We will show that there are sixteen different types of these codes and classify them in terms of their generators.
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