We prove dyadic entropy expansion for the observables $X+Y$ and $f(X,Y)$ under Frostman nonconcentration hypotheses on a prescribed, possibly dependent law. For an integer $n\ge1$, write $H_n(Z)=H(\lfloor 2^nZ\rfloor)$ for the base-two Shannon entropy at resolution $2^{-n}$; thus $n$ indexes the fineness of the dyadic discretization. For every $0<s<1$ and every real bivariate polynomial outside the family $H(ax+by+c)$, conditional Frostman regularity with common exponent $s$ forces one of the two output entropies to exceed $sn$ by a fixed positive multiple of $n$. Under rectangular Frostman regularity, the same conclusion holds after including the average marginal entropy in the maximum. The proof combines the discretized Elekes--Rónyai and web theorems of Raz and Zahl with simultaneous information profiles and an estimate for mass near critical layers. A second argument, based on Pham's folding estimate and a mutual information penalty, gives explicit gains. If the conditional laws of $X$ given $Y$ and of $Y$ given $X$ have Frostman exponents $s_1,s_2\in(0,1)$, respectively, with $s_1+s_2>4/3$, we obtain $\max\{H_n(X+Y),H_n(f(X,Y))\}\ge (\frac{s_1+s_2}{2}+\varepsilon)n-O(1)$ for an explicit $\varepsilon>0$. Here the baseline averages the two Frostman exponents. We also classify the exceptional coordinate representations and construct obstructions for algebraic affine directions with Frostman constants uniform in the scale.

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