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Theories of planet formation give contradicting results of how frequentclose-in giant planets of intermediate mass stars (IMSs; $\rm 1.3\leqM_{\star}\leq 3.2\,M_{\rm \odot}$) are. Some theories predict a high rate ofIMSs with close-in gas giants, while others predict a very low rate. Thus,determining the frequency of close-in giant planets of IMSs is an importanttest for theories of planet formation. We use the CoRoT survey to determine theabsolute frequency of IMSs that harbour at least one close-in giant planet andcompare it to that of solar-like stars. The CoRoT transit survey is ideal forthis purpose, because of its completeness for gas-giant planets with orbitalperiods of less than 10 days and its large sample of main-sequence IMSs. Wepresent a high precision radial velocity follow-up programme and conclude on 17promising transit candidates of IMSs, observed with CoRoT. We report thedetection of CoRoT-34b, a brown dwarf close to the hydrogen burning limit,orbiting a 1.1 Gyr A-type main-sequence star. We also confirm two inflatedgiant planets, CoRoT-35b, part of a possible planetary system around ametal-poor star, and CoRoT-36b on a misaligned orbit. We find that $0.12 \pm0.10\,\%$ of IMSs between $1.3\leq M_{\star}\leq 1.6 M_{\rm \odot}$ observed byCoRoT do harbour at least one close-in giant planet. This is significantlylower than the frequency ($0.70 \pm 0.16\,\%$) for solar-mass stars, as well asthe frequency of IMSs harbouring long-period planets ($\rm \sim 8\,\%$).

Sub-stellar Companions of Intermediate-mass Stars with CoRoT: CoRoT-34b, CoRoT-35b, and CoRoT-36b