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@DFP
Absolutely you can,
in gardening guides it often suggests adding tomato feed to this or that. Its basically a rich NPK fertiliser, stuff intended for house plants will probably be more orientated around the nitrogen and less rich as house plants usually grown slowly, have no fruit or flowers.
You can use it on potted patio flowers, hanging baskets etc. Id generally refrain from using an artificial fertiliser for anything in the ground though. There should be enough nutrients in the soil & compost and you disrupt the natural balance.
In regards to your tomato seedlings, dont worry about it. They are pretty robust. You can let them grow on till they are really crammed and crowded in current container, then seperate them later even if it means tearing the roots somewhat. They will barely notice it once you pot them up. But getting a too small seedling and planting in a separate pot where it may not be given the same ideal warm conditions as when crammed in the propagator, will have more of a negative effect, will slow down growth.