...Likely too large, and you'd need to always cook the fries first to avoid transferring any oyster-ness to the fries.
I think this fryer's 1.8 liter max oil capacity, for which 1.5 l is the minimum to operate it, might prove wasteful. Although you can filter and reuse the oil successfully, I wouldn't if there is seafood involved.
I bought this one because I cook long items, like churros and strips, but maybe one of the round fryers might be best for small, roundish-food batches.