The ornamental design for a trolling baitholder, as shown and described.
1. Trolling bait holder
1.1 : Left
1.2 : Top
1.3 : Right
1.4 : Bottom
1.5 : Back
1.6 : Front
1.7 : Unfolded
A holder for use in holding trolling bait prior to use of the bait in trolling; a rod passes through the eye sockets of the bait, which are empty, and which bait are individually releasable from the handle as bait is needed.
The broken line showing of 5 bait fish in figure 1.1 is included for the purpose of illustrating environment and forms no part of the claimed design.